15 x 15 .. a baby like mine 8 x 12 :) I want aiming to do the same as you , and some PCB's perhaps , mine off the shelf though, although someone did suggest now I havea small CNC I could build a bigger one with it well some of the parts at least, when I can get it to run that is , and its been sat there for a month now all I'm missing is a bloody cable! lol good look with the build..