This would be a great machine, I wonder the same thing - is it possible for you to build and sell these or do you know of similar machines? They seem better than say a myDIYCNC.
Make them a different color or style altogether though, this almost makes me cringe and the yellow is used too much and is not the right yellow to have the desired effect of the De Stijl movement, who with the yellow wanted to extend the shape into space.