I have decided to build my CNC router based on a design by CNCzone.com forum user jgro.
This is a 3D view of the CAD design.
Here is a pile of parts I have completed.
As you can see I am making a real mess in the garage.
Here are the bearing assemblies for all 3 axis. These are made from aluminum angle and skate bearings and will ride on black gas pipe to form a linear bearing.
Here is the back of the x-axis assembly, showing the parallel bearings.