Also, Hawk, the last time I was at the gym I got a better look at the nicrotek wall paint, and I decided it must be a flat acrylic behr-like texture paint with sand added. If you decide you want paint, and you want macrotexture to compliment your microtexture, you might consider using that or start with texture paint and then add sand. In any case, it's worth pointing out that the sand changes the properties of the paint to where it crumbles rather than chips off. BTW, LOTS of complimemnts on my texture so far. Anyway, hope your little "machine" is treating you well :).
the kid and i have exposed horizonal rafters in our fish camp cook house,and the test is to grab/pinch the bottom and just hold on ,at all,,anyway as some kind of indoor device keeps us all alittle more motivated, and wood is easy to work with ,i;ve tried a few,,try an angle grinder to create some texture and grainey surface for better ,user friendly grip,,let me know how it works,,keep on jambin,