Tommy,
Reid supply is a great resource for CAD drawings.
http://www.reidsupply.com/cad.aspx
They also sell precision acme rod, but probably not 1/2-10 5 start.
Their Nook rolled ballscrews look very nice, I just bought one this week !
I may save it for my next (bigger) router, still working on my 1st. Tough to work in a kerosene heated garage when the temperature is in the teens. Carbon monoxide has claimed way too many brain cells.
