Beautiful,

Only one question; how do you plan to lubricate the ball-screw that rides inside of Z? having run into this issue myself, I though it wise to point it out. One option is to machine a port into the plate and have the zerk (grease) nipple come out through it to the front and thereby save yourself from having any future issues with greasing the ball nut (not something that has to be done often but trust me not fun to do with having to remove half the Z to get at things. Other then that great design and keep on with what looks to be a wonderful build.

Michael