This Instructable is not going to be a step by step build log of my machine, but an overview of my design and what I learned over the course of this build. Hopefully I can share a few things to help with your CNC build.
My frame design was based on various moving gantry CNC routers from around the internet, with a few alterations. I chose aluminum as my building material mainly because it was easily cuttable with the tools I had available, and I figured it would have much greater stability than a wood frame.
dbc1218's DIY-CNC-router build (http://www.instructables.com/id/DIY-CNC-Router/) guided me through most of the internals of the system such as the linear guide rails, ACME lead screws and nuts, and also with the CNC controller and stepper motors. If you want a step-by-step guide I would strongly recommend dbc1281's instructable.