Interesting thought process. So instead of tiling from front to back you want to do it from left to right. Easy to do, if not using the QCW. What about milling your own aluminum ones. I guess you could use the dimensions from the QCW for sizing and just get longer M5/M6/M? bolts similar to what Rowdy did for his Z Axis lifts above… My machine is in storage (sold house and living in an Apt, until the retirement home is built by end of Apr or May) or I would try to mock it up for you… I will follow as this is something I would be interested in as well.
If you’re not on any particular hurry you could just do it along the front to back axis, only means doing 32" at a time instead of 48" but if you’re just sliding your moulding along a fixture each step of the way it seems much much simpler than sourcing feet risers and mounting them only to do the same operation on the longer axis. You would also want to remove them after rather than have the longer extension to get to your work. Just sayin’.
@CandL I get these things in my head and can’t stop running through different scenarios. If you really do want to do the mouldings in longer steps, why not just do it at an angle , from front right corner to back left corner ? Now you would be doing it in increments even longer than 48" ( tries to remember geometry from 50 years ago… the square of the hypotenuse something, something. Anyway, longer than 48" ! )