I notice that the OX gantry plates, at least the ones @Brandon_Satterfield sent me, but also on the official drawings, have an extra set of holes in front of the slots that hold the X rails between the gantry plates. It almost looks as if they are intended to accommodate using three 20x60 X rails bundled into a 60x60 pack.
I don’t plan on doing this now, but I’m just curious whether changing the wheel axis bolts to ones 20mm longer and adding a 20mm spacer in between the wheels in order to use an additional cross beam is a thing that people do on the OX, or if those holes actually have a different purpose.