I'm about 1/2 way through construction and have most of the mechanical parts rounded up, I'm trying to take my time and get the tolerances as close as possible. I think when I'm done and I've got it up, running and have wrapped my brain around the whole concept I'm going to design my own version. I can already think of a few improvements over the original Repstrap design, and I've been wanting to try my hand at metal casting so that'll probably come into play.