Sorry I can't look it up right now (on phone), but Carlos Centipede Extended
shows angles in his rough sketch-up.
EDIT:
Here is the site. It doesn't show the angles like I thought but what I did was print it out and measure the angles myself with a protractor. You can do that same with Jakobud's. Or as EvilNuff said, use Google Sketchup.
Also keep in mind that with what I did and what Carlos did, extra width, depth and height were added to accommodate more controls and a bigger monitor.
I do remember there being some odd angles on the cab, but it's not too bad.