AutoCAD drawings of Milling Machines wanted...

Hello everybody!!!
I' m a student of Mechanical Engineering and I have a small problem.
My group (me and other 4 students) has a task to design a CNC Milling
Machine (bed type). Since we didn't know where to start, we were
searching the Internet hoping to find files containing technical data
and CAD drawings for that kind of machines. But we found only
pictures with poor data.

So, I'm asking you if you know any location where we could find files
like:

AutoCAD drawings of any Milling Machine part or assembly(.dwg, .dxf)
Any kind of informations related with design of Milling Machines.

Thank you,

Dan.