Very kind, but I wouldn't put my work in the same category as routercnc.

In hindsight I think one big improvement to this Z-axis would be to use longer rails and Z-plate, such that in the full down position the top of the Z-plate is flush with the top of the main body, thus keeping the unit sealed at all times when down in a cutting position. That would also allow one to space the upper carriages up without losing travel, thus giving an even more rigid setup.

Oh well, there's always a v2 ;)