Well Zone, the time has come and I have begun building my machine. As the title suggests, the frame will not be welded. Instead, all joints will be bolted via tapped holes in the steel. The basic material I'm using is 75 X 50 X 4 mm RHS (rectangular hollow section). My build log will be a "warts and all" account and so I already don't apologise for being verbose and possibly getting sidetracked during the process of documenting the build.
Here is a basic render of the machine done in SolidWorks
The motors are Yasgawa brushless servos obtained from "FA Parts" on eBay. I have all THK SR20 trucks and rails. All drives will be via ballscrew with a single central screw on the X axis.