I saw an interesting question/suggestion come across the forum awhile ago. The OP wanted to purchase tubing for a bigger machine but then wanted to slide the feet inward, leaving tubing hanging off the end of the feet.This made his machine smaller most of the time (results in better performance and better accuracy), but when he wanted a bigger table, he would unscrew a pair of feet, loosen the belt, and slid the feet to the end of the tubing.
I don’t know if the OP ever followed through on his design, but thought it was an interesting compromise solution. It doesn’t come for free since longer tubing, longer cables, and longer belts would need to be purchased and designed in.
P.S. Since you use a CNC at work, I’d be interesting in your comparison between the MPCNC and your work machine when you have it up and running and have spent some time with it.