Great project Claude. The classic Obsession design is rock solid and never bettered on performance (it can be beaten on portability!)
The GSO mirrors are good. It is amazing that large mirrors of reasonable quality should be available at such a low price. But seeing you are thinking of going that extra few yards by fitting Goto, you may wish to consider top quality optics from Mark Suchting (Satchmo on this forum). A little bit more $, but a lot more bang.
On the subject of Goto. The ArgoNavis / Secvocat combination is very nice indeed. If you go down that route I have a couple of installation tips ...
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