Found this program online if anyones interested in playing with building a chassis.

Dream Car Builder(2018) | SKIDROW |Size: 1.26 GB

Dream Car Builder is a game where you can design your own car and race it. Designing the perfect frame and steering system is no simple matter. If you are interested, and are up for the challenge, this game is for you!

Car editor: Build your own cars.
Single player: Race on procedurally generated tracks.
Sandbox: Build cars without limitations.
100% realistic soft body physics:
Slow down the time. Build deformable cars.
User-generated content:
Create and share your vehicles, tracks and maps.
Attention: You can compete with your friends, see their cars, create tracks and setup conditions for each race. But you cannot collide with the other players' cars. This is not a realtime multi-player game!

System Requirements:
OS: Windows 7 - Windows 10
Processor: Multi-core desktop processor
Memory: 8 GB RAM
Graphics: 1920 x 1080
DirectX: Version 9.0
Storage: 2 GB available space
Additional Notes: Keyboard that can support more than 3 of simultaneous presses.