@catkinsonfox said:
My problem is, I'd love to create separate components that I could then drag over and attach to the main component. Think the complexity of a motorcycles engine! Is it possible to do that? I have not yet tried it, having crashed and burned the first time (two years ago) I even thought of the idea . . .
Conversely, are there any 3D models of motorcycles I could borrow and modify to give me what I need: decent 6-view renderings of the basic machine -- chassis, engine, wheels/tires, etc.?
Yes. You can create separate components and attach them to the main model. You should spend some time learning the basics of SketchUp. Watch the tutorial videos on the SketchUp website as well as here and other places.
You can check out the 3D Warehouse for motorcycles or the parts. You might find what you need there.