Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the go_kart_buggy_generator zip.

Usage

1. Open the Go-Kart tab in the 3D viewport sidebar (N). With nothing selected, click the picture to choose one of the 47 designs, or browse the ten families, and add it at the 3D cursor. You can also use Shift+A, Mesh, Go-Kart / Buggy.
2. The card at the top shows the design, its size, wheelbase and face count. Surprise Me makes a new random vehicle, Variation changes the current one a little, Random Livery repaints it and Reset goes back to the design.
3. The icon tabs hold every setting: Vehicle (kind and chassis), Wheels (tyres, rims, sizes), Body (bodywork, bumpers, cage, lights), Power (engine, exhaust, radiator), Driver (seat, steering, pedals), Livery (colors, pattern, race number), Wear (condition, dirt, mud, rust), Drive (steering, rolling, keyframes, Roll With Motion) and Parts (detail, seed, rebuild, delete).
4. Every picture choice opens a gallery: click the picture next to a setting to see all its options, or step through them with the arrows.

To animate, keyframe Steering and Drive in the Drive tab, or press Roll With Motion so the wheels follow the vehicle's own movement. The Seat, Hand and Foot empties show where to place a driver.