I played around with sketchup last night... but I need to go through the tutorial. It's not super intuitive. 
Yes, I agree, it's not super intuitive. And that's coming from someone who has had years of experience with most graphics design software and quite a bit of 2D Autocad. It takes a lot of forethought and planning to create compound curves that intersect with other compound curves.
Instead of creating something in the order of, step A, step B, step C, you have to make a rough "step C" and then cut away "step B" and "step A" to end up with the finished part. Still, once you get the hang of the great tools like "extrude" and "scale", it's a lot of fun.
For me the Google tutorials are painful to go through, and don't really show you all the creative ways of using the various tools in unison, so I bought a book to help me get running quickly with this. I'm not a big fan of the "Dummies" books, but the "Sketchup 7 for Dummies" is done nicely and I'm still working my way through it.
There is a balance to keep in mind, keeping the model detailed and small in file size.
The
M-130 driver is made up of groups within groups. So, if one were to only see the face of the driver you could completely delete the whole backside of it, thus having a smaller file. You can also scale it to match whatever size driver you needed.
