Here is one I built about 6 months ago. I use the 8linx board. I updated the motors to 100oz and got more speed on a 3/8-16 rods on my X-axis and used ACME 3/8-10 for the Y-axis. Both axis operate about 3mm/s and its fast enough. Got most of my information from the French sites and tables already built.
I did not want to have to build a 6" box platform so I made some modifications.
This cost me about $200 for the electronics and another $250 on linear bearings and shafts. The rest of the parts I made from plastic (cutting board) and wood as I do not have access to a milling machine.
Vic