iOptron Tri-Pier Accessory Rail and Friends

This project started out as a way to hold the handbox for my CEM60 in a fashion that I could easily use in the dark with one hand. The wrist strap is just annoying and only a marginal attempt at best on an otherwise stellar mount (forgive the pun).

I also wanted something to hold my 12v PSU off the ground and if I'm already doing that I might as well move my USB hub to the pier.

All accessories are retained to the cleat with M4 socket head screws. The cleat is held flush to the column so