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 Advanced Tank Designer v0.9.0 - "Feedback Pass"
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This release is built almost entirely on community feedback.
Nearly every point raised was reproduced in the files and fixed.
Thank you for the detailed report - it made the mod better.

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FIXED - SLOTS AND MODULE STACKING
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* Slot labels now mean what they say. Previously "Additional
  Systems", "Observation Systems" and "Hull Systems" all accepted
  every module category, which made the dedicated Transmission /
  Fire Control / Survivability / Crew Support slots pointless.
  Every slot is now restricted to exactly one function:
      Transmission      -> transmission only          (1 total)
      Fire Control      -> fire control only          (1 total)
      Powertrain        -> powertrain only            (1 total)
      Crew Support      -> crew support only          (1 total)
      Survivability x2  -> survivability only         (2 total)
      Observation  x2   -> observation only           (2 total)
      Radio             -> radio only                 (1 total)
      Hull Systems x2   -> special equipment
* You can no longer fit two transmissions or two fire-control
  systems on the same vehicle.
* The same module can no longer be installed multiple times.
  Stacking four identical vision devices is over.
* Observation equipment (cupola, periscope, observation suite,
  night sight) is now its own category instead of sharing the
  crew-support pool.

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FIXED - COSTS THAT DID NOT SCALE
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* Armor and protection modules now cost a PERCENTAGE of vehicle
  cost instead of a flat value. Fitting laminate armor or a spall
  liner to a super-heavy is now appropriately expensive, exactly
  as it should be.
      Face-Hardened Armor        +32% armor   +8%  cost
      High-Hardness Welded Plate +36% armor   +14% cost
      Spaced Laminate Armor      +44% armor   +22% cost
      Internal Spall Liner                    +4%  cost
      Integrated Fighting Comp.               +7%  cost
  These are deliberately kept moderate. The goal is that armor is
  no longer free, not that a fully equipped tank becomes unaffordable.
* Bolted Rolled Armor actually works now. Its description promised
  cheap mass production while delivering a negligible flat saving;
  it now reduces vehicle production cost by 18%.

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BALANCE
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* Armor and engine upgrade sliders carry real economic trade-offs
  again: armor costs +0.15 IC and -0.1 speed per level, the engine
  +0.075 IC and +0.05 fuel. The old override had removed the speed
  penalty entirely and charged only +0.04 IC, which is what made
  armor almost free. These sit slightly under vanilla's +0.2 / +0.1
  because ATD vehicles carry far more paid equipment on top.
  Only the reliability curve is softened (-0.006 per level instead
  of vanilla's -0.015). With two twenty-level sliders vanilla alone
  costs -60% reliability, and ATD's modules add more on top - a
  fully upgraded tank ended up unusable. Maxing everything now
  costs about -27% reliability instead of -67%.
  The stray "0" bonuses are gone.
* Gun tuning and ammunition upgrades are now a real decision.
  They add meaningful production cost and reliability loss per
  level instead of being free power you always max out.
* Fire control and observation devices are priced for the
  multiplicative bonuses they provide.
* The ATD radio line is priced against vanilla radios instead of
  being roughly four times cheaper for a comparable effect.

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HULL EQUIPMENT REWORK (v0.9.1)
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* The Hull Equipment row ("Transmission - Protection") no longer
  holds a crew-survivability module in the protection slot, which
  never made sense. Survivability now lives only in its Turret &
  Crew slot.
* New PROTECTION module category with period-appropriate WW2
  add-on armor (separate from the main armor type):
      Track-Link Field Armor   - from start, cheap improvised
      Reinforced Belly Plate    - armor tech 1, mine protection
      Bolt-on Applique Armor    - armor tech 1, +armor/-mobility
      Side Skirts (Schurzen)    - armor tech 2, vs infantry AT
      Anti-HEAT Mesh Screens    - armor tech 3, late-war standoff
* The hull row now offers a second transmission slot, so a design
  can mount two transmissions if desired.

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COMPATIBILITY
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* The Road to 56 and Extended Tech Tree 1960 patches now also
  carry the tank chassis definition, so the new slot layout works
  correctly alongside those mods.

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KNOWN / NEXT
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* Land Cruiser designer layout is still cosmetically off. The
  vehicle works correctly; the panel arrangement will be rebuilt
  in a follow-up.
* Costs are tuned so a maxed-out heavy sits roughly 15% above the
  old value rather than 60% above it. Feedback on where the ceiling
  should sit is welcome.
* Module stat lines will be simplified in the next pass so each
  module has a clearer identity instead of many small modifiers.

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 TURKCE OZET
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* Slot isimleri artik gercekten kisitlayici: iki sanziman veya iki
  atis kontrolu takilamaz, ayni modul birden fazla kez eklenemez.
* Gozlem ekipmanlari ayri bir kategori oldu.
* Zirh ve koruma modullerinin maliyeti yuzdesel hale geldi; buyuk
  tanklarda artik gercek bedel odeniyor.
* Cividili zirh gercek bir uretim indirimi veriyor (-%18).
* Zirh/motor sliderlari vanilla'nin maliyet ve hiz takaslarini geri
  aldi; sadece guvenilirlik egrisi yumusatildi. Her seyi sonuna
  kadar acilmis bir tank artik -%27 guvenilirlik oduyor (-%67 degil).
* Top ve muhimmat yukseltmeleri bedava guc olmaktan cikti.
* Telsiz yeniden "Optik ve Telsiz" satirindaki kendi kutusuna
  takilabiliyor.
* Ana mod artik kendi countrytechtreeview.gui dosyasini tasiyor;
  yamasiz, tek basina da tam ATD tank agacini gosteriyor.
* Govde satirindaki "koruma" slotu artik gercek zirh koruma
  modulleri aliyor (palet zirhi, civatali ek zirh, zirh etekleri,
  takviyeli taban, kumulatif onleyici ekranlar). Murettebat
  hayatta kalabilirligi yalnizca kendi slotunda.
* Govde satirinda ikinci bir sanziman slotu var.
