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Yes David, that can be a hurdle, although I would say that unlike a mount where you may machine bearing houses or do interference fits there are no such difficulties with this scope.
while you need things to be square and concentric, which the lathe and the mill will do for you there is nothing particularly demanding about the project - other than time!
Alex, you mentioned that the scope looked big for a 12.5" . It is 910mm long from the rear of the backplate to the front of the upper ring. This doenst include the adaptors mounted to the backplate.
It is probably a bit wider then the average 12.5". This is because I thought if I went bigger I might want to just replace the optics and keep the OTA so I thought about making something which I could swap out the mirror cell with one for a 14". So it's ~410mm across, that about 45mm each side larger then the mirror.
It was only a half hearted attempt that I didnt reaaly take to seriously. It's probably too small to fit a 14" but not much larger then required for a 12.5"
I think some of the problem if the distortion that the wide angle gives when you are close up. Even though the mount is very close to the scope it looks smaller with that lens.
Jason
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