5,000 cash, reputation 12, 1 research point, 1 factory, and a utility-truck design, then manages the company month by month through December 1950. The core loop is: configure a prototype using a chassis role and four 0–5 sliders, advance one or six months to sell vehicles and receive net profit/research, buy factories, research a gated technology tree, and improve military contract bids checked every June. Use a Three.js-style showroom scene as the full-screen background: a dark olive/charcoal factory environment with fog, warm cream/brass directional lighting, shadows, and a circular industrial turntable floor marked with brass segments. Put the current procedural prototype vehicle on the turntable, viewed from an elevated three-quarter camera, slowly rotating continuously. The vehicle should visibly change with the date, role, sliders, and researched technology. Use period palettes: dark green/brass/wood for 1910, blue/brass for the 1920s, dark burgundy/brass for the 1930s, blue with pale trim for the 1940s/postwar, and military olive drab for military vehicles. Procedurally model these vehicles from simple boxes, cylinders, wheels, lamps, grilles, body panels, turrets, tracks, and windows. Before 1920, civilian vehicles are brass-era designs with tall thin spoked wheels, a long hood, upright brass radiator, open bench seating, folded canvas roof, hand crank, wood cargo bed, brass lamps, and spare tire. From 1920 to 1934, civilian/utility models have tall flat grilles, squared cabs, black canvas roofs, split windscreens, separate black fenders, running boards, and utility stake beds with wood side boards. From 1935 to 1945, use more streamlined/slanted grilles, rounded cabs, sloped windscreens, and integrated running boards. From 1946 onward, use rounded postwar/ponton forms: bulbous hood, broad chrome horizontal grille bars, body-color fenders, wide windshield and side windows, hubcaps, and smooth pickup bed. Military roles use olive armored bodies; armored cars add a turret and machine gun, while tanks have broad side track/sponson shapes, multiple road wheels, turret, and a cannon. Later-era military models use sloped/cast armor; researched radio adds a visible antenna. Add visible armor strips based on armor slider, and scale the prototype subtly with capacity and armor. The design screen must show the heading “Vehicle designer,” explanatory text that power sells, armor wins contracts, reliability protects reputation, and cargo boosts utility bids, then role cards for: Civilian runabout, Utility truck, Military carrier, Armored car, and Tank. Civilian and utility are initially available; military carrier requires “Military Carrier Program,” armored car requires “Armored Car Doctrine,” and tank requires “Tracked Tank Program.” Locked cards visibly show a lock and prerequisite. Let the player change Engine size, Armor plating, Cargo / seats, and Reliability focus with range sliders from 0 to 5. Armor is disabled until Pressed Steel Frames is researched. Show computed Power, Armor, Capacity, Reliability percentage, Quality, Unit cost, Sale price, and Profit/unit. Implement the exact design tradeoff logic: power starts at 18 plus 13 per engine point, with technology bonuses from Diesel Experiments for non-civilian vehicles, V8 Engine Program for non-military vehicles, and Independent Suspension; subtract armor weight and tank penalty, add reliability contribution. Armor is 14 per armor point, plus steel, armored-car/tank role bonuses, and welded/sloped armor technology bonuses. Capacity is 1 plus 9 per cargo point, with utility bonus and tank penalty. Reliability starts at 58 plus 12 per reliability point, penalized by engine, armor, and tank role, and improved by assembly, hydraulic brakes, suspension, automatic transmission, and welded armor on tanks; clamp it from 5 to 99. Quality combines power, armor, capacity, reliability, and quality technologies and is clamped from 1 to 180. Unit cost rises with engine, armor, cargo, reliability, military/armored-car/tank surcharges. Sale price depends on role base price, quality, cargo, armor, and postwar civilian design bonus. Every month, calculate units sold from factories, role demand, reputation, and quality. Assembly Line gives +40% factory output, Mass Production Tooling +25%, Jet Age Production Planning +15%. Civilian runabout base price/demand are