I wanted to try a different way of operating the Z Axis so I setup a tower using 40x40. In the end it worked excellently and can easily print 60mm/s with 150mm/s travels. The coreXY is a very cool kinematic, and you can get some pretty great speed and accuracy. The main issue is the fact your Steps/mm are doubled, so the lower end motors don't like it at high speeds.

Similar to C-Beam Machine build, but with inverted Y-axis assembly to shield drive screw. Integrated XZ gantry can be fixed to any solid surface. Build dimensions are 36" x 36" x 6".

Moveable Lead CNC1010 build with handles on four corners. Everything fits on one sheet of cut out 4x8 plywood