Keep this coming, I'm building the same thing right now. I have my power supply, breakout board, 3 steppers, 3 drivers, Y and Z axis roton ball screws and nuts (need X axis screw) and about 40' of linear rails and trucks I got from an auction. My frame is being built on the 80/20 aluminum extrusion with linear rails mounted to it and the gantry of similar material. I am building a small machine sort of modeled after the 2' x 4' series that Torchmate sells.
Since I'm still planning the frame, any different ideas you have may help me immensely.
Thanks for posting this and please keep it up!!