I need a chassis and suspension design similar to Ariel Atom but it can be Box section Aluminium , what software does this ? I cant draw 3d very well but I want to make cars and sell them ,

I cant draw 3d very well but I want to make cars and sell them in Australia, Exo cars would be good as track cars and also as extreme 4x4s , but i need to design chassis and suspension to suit GM LS V8.
I made a Model of a Supercar Id like to build but it would be cheaper to build and sell cars like the Ariel Atom.