ok i pushed ahead with the design with the thought of keeping the 60x40 in.

so this is 90% of the way there i just need to chuck the motors in.

Click image for larger version.  Name: cnc no motors.png  Views: 457  Size: 949.2 KB  ID: 7252

the colour coding is basicly for me so i know which parts form each axis... for the x axis i'm looking at twin screws driven by one motor from the centre with a timing belt, i would have liked to have used one screw to keep the cost down but i imagine you guys will tell me thats a big no?

can you guys see anything wrong with this design?