Looks good. I've used various RAM products in the past and they have all work well. The only question I have stems from using a similar tripod leg setup - how stable is it? I had put everything together testing it in my backyard and thought I'd have no problems on to find that I was very leery of doing any movements past a couple feet without first removing the SP. Again, this is only from a landscape viewpoint as I was on a very rocky uneven ground in Valley of Fire and had want to relocate several yards from my first shot. Indoors should really matter.
This is great seeing other ways to mount and tether the SP.