Z-Axis & X Gantry Mounts for Acme Nut Blocks

I had a lot of issues with z-banding on my AM8, and having spent more than I could really afford on good quality 8*8 lead screws and hardened steel guide rods I couldn't just give up and switch to linear guides + belts. I figured the best way to get good Z was to get the vertical elements as tight to the gantry and to the frame uprights as I possibly could. I also wanted to squeeze more Z out of the frame - I was losing 40-odd mm with my old setup. This rig together with the titan X carriage got