Yes, thats true.....
The design process worries me a bit..
It would seem to involve some trial and error and redesigning of parts to make other parts work properly....
Not sure I have the patience to design a CNC Router from scratch. I think it would take a long time to get all the bugs out.
The most obvious question for me, is do you design the frame dimensions to match the ballscrews lengths available?
I'd assume so, as its easier to cut extrusion to size than get custom ball screws manufactured....
Other option is to use someones else design.
Getting all the parts sqquare and aligned scares me too...lol