Hi CW,
Thanks for your critical comments.
Supporting the core pieces, I used a Swar Telescope rail, Velbon 530, Manfrotto 510 HDV (as suggested by a forum member), and release cable.
In retrospective, I did not have a methodological testing. Just played around and look for an initial success at a very low benchmark. No incremental ISO, nor f-stop. I was very busy in searching for an object through the camera LCD and manipulating the focusing ring on the scope barrel. As an aging retiree with presbyopia, I needed to take off my glasses when I concentrated on the LCD for focusing and put them on again. Vibration and viewer blackout were new for me too. The results were predictable and I had no reason to be proud with them. I am glad that you have made it straight.
Will use an AF zoom with a fixed focus eyepiece in my next test after its delivery. Your suggested incremental approach will be used. Will take along another pair of lo fa glasses and see it helps.
Thanks again, CW. Till then,
jojomau