Sooo i downloaded an beamng 0.1 version and idk how to change the car i drive. Note :This is not the TechDemo
ctrl+E opens the vehicle selector and ctrl+W opens the parts selector. (it also still does in the current version )
That version didnt have the ui from what ive seen from online videos, i remember people saying that you had to change the car via world editor, never tried the build so cant 100% confirm but i remember it being the case