[AdamHeard]

The tolerances aren't as critical as you would think. If someone knows how to use the mill, their tolerances are likely good enough.

Check out our 2011 prototype CAD (posted in my sig) to see the elevator. Where we did gussets, and a waterjet rack gear, you could do completely different. The overall layout and bearing setup is decently easy though.

We mill 12-14" sections at a time, and then scoot the part down and rezoro off the last hole drilled by just shoving the drill bit in the hole (more specifically, we just leave the drill bit in the last hole drilled, open the vice, full travel X, reclamp vice). We call it "table jumping". We do it for any tubing longer than table travel.