I've got some chassis and bodywork drawings that I would like to edit. They are STL files so I need to know which of the basic CAD packages will be able to read them.

Any ideas?

Define basic. I know for a fact Pro/Engineer and Solidworks would be suitable. ProDesktop 8 will export stereolithography files but not import.

Cheers

I am fairly proficient with 2D progs like CorelDraw etc but 3D is a bit daunting to me so I need a novice style prog that will allow basic editing (moving a chassis rail, tweaking a door measurement etc) so that I can make a new CNC buck in foam or something similar.

try Rhino

free evaluation copy to download to start with (25 saves)
its got built in tutorials

www.rhino3d.com

Solidworks will handle STL files just fine. YOu can import them as a solid body or surface body which is nice...

Cheers
Andy