[](/scootaplease) You may need an account on AutoDesk's website to play with this, but I'm sure all my Engineer Brony's have one. Ill upload a link to a .DWG if anyone is interested.
[edit] You don't need an account to view it. But ACad WS wont let you change the background to white if you don't log in. you can still change the view type to greyscale though. It almost looks cooler that way.
https://www.autocadws.com/main/publish?link=SEVfbW1jU2luaHdMVmw3
Blender might be useful, but is probably similar to milkshape.
There's also this website I recently found that lets you edit existing autocad files for free, but from what I've read it doesn't let you create new ones.