Over the past few days i've swapped a few messages with Al B Thayer, as i've just bought his lift plans (not sure when i'll do the build, but i'm going to try it). When i mentioned considering using a set of miter gears so i wouldn't have to move my Incra--Al pointed out that would likely introduce more lash than i'd probably want. That makes sense to me.
Since his design mounts vertically, my current (imcomplete) thought is to add a compartment inside my cabinet, so i can mount to the side instead of the back of the cabinet--and gain some bit storage at the same time. That would put my height adjustment in line with the bit.
Still, long term, i like the "sidewinder" thought. I don't think i like it $700 worth, but i like it!!