If you move the bed instead of the gantry you can get away with a single stepper for Z (like vzbot/bambu). As for stress/strain I'm pretty sure play in the bearings/blocks alone will cause too much play, not convinced modularity is worth all this trouble and I don't think it'll ever work well without support on both sides.
Have you looked at the hash motion system yet? Would be perfect for this (except the modularity).
If you move the bed instead of the gantry you can get away with a single stepper for Z (like vzbot/bambu). As for stress/strain I'm pretty sure play in the bearings/blocks alone will cause too much play, not convinced modularity is worth all this trouble and I don't think it'll ever work well without support on both sides.
Have you looked at the hash motion system yet? Would be perfect for this (except the modularity).