Parts into CAD

Earlier tonight, I tweeted that I'd draw _A_ part into CAD, then go to bed.  Seven (relatively simple) parts later, I'm really going to bed.

So far, we've got the following parts drawn, between Austin and me:
- Valve Chest
- Throttle Chest
- Valve Chest Cover
- Steam Chest Cover (Throttle Chest Cover?)
- Back Cylinder Head (Austin drew this one)
- Front Cylinder Head
- Piston
- Throttle Valve
- Throttle Nut
- Valve
- Valve Nut
- Crosshead

6 more parts, and we're done with page 4, the first of three pages detailing the parts of the engine itself.