I’ve built two, and the 90 is usually the design i recommend.
My first one was just a quick test with the parts from my Prusa - it had 350x225x200mm travel in xyz, used 8mm rods, 6mm MDF and T5 belts.
It worked so well that i decided to make another one with a 450x225x220 build envelope, 12mm rods (the scad makes a couple mistakes for that size), 18mm birch plywood and HTD-3M-15 belts. Just like any other printer, the original parts will work well enough, but for optimum performance, you’ll want to redesign a couple spots. What makes it special is the clean design - the two rear buttresses that provide a nice spot to mount electronics. It’s also fairly simple to build - once you have the sheets drilled, everything “snaps” into place, no adjustment needed.
Oh, and if you use wood, paint it to keep the wood’s moisture constant, this will keep it from bending and moving.