Thanks JohnG, Ric and Rich. Indeed, it's all starting to come together.
I've done some research on this. The FSQ when operating at F/5 has a CFZ of 55 microns. The RoboFocus has a step size of approx 7.5 microns, so hitting the focus sweet spot shouldn't be too hard. I sense maintaining critical focus is going to be a little more difficult. From reports I've read, the new FSQ is no different to the original when it comes to temperature shifts, so I suspect I will be refocusing a lot. Which isn't a major issue once I establish a good v-curve model in FocusMax. Actually, the Custom Scientific (CS) filter set I have are not all parfocal so refocusing is inevitable - the CS Ha filter is slightly thicker than the CS LRGB set.
Anyway, attached are a few final pics showing the STL Feldstein#6 adapter, Robofocus mounting and the entire imaging train - which is very clean. There are no focal reducers or in-path focusers which would change the focal length. I will do some plate solves to determine my precise arcsec/pixel (it should be around 3.5). I will be taking the scope down to the observatory in the coming weeks so first light shouldn't be too far away. Can't wait.
