Remix of GeoDave's Remix of Allted's Simple CNC Table to make it parametric

I wanted to add casters to GeoDave's remix of Allted's table for his MPCNC. Thanks for the great table idea.

For rigidity I wanted to keep the work area to 24"x24" and the table top at countertop height of 36". So the total default table dimensions are 38"x38"x36". These can be modified by changing the variables.

The bottom "joists" are flat to both give more shelf space, but also to have something wide enough to attach the casters to. You can join these however you'd like, but I'll probab