[Tandum (Robin)]

I've been looking for Large Format OAG's with a minimum 54mm clear aperture. I've excluded the monster OAG due to cost and as far as I can see, that leaves the Atik and the SX.

The Atik chews 24mm of back focus and the SX uses 17mm, so the SX looks like the preferred device. I want to bolt this to a qhy wheel at this stage and was wondering if anyone has done this already?

Also, are there any I've overlooked?