Many thanks Lewis, Poppy, Paul, Laurie, David and Julian. It is very nice to get such generous feedback.
The building of the scope is rather addictive, and very rewarding when things work out. I have only had a couple of "Re-Do This Bit" so far but it is all a learning process.
You have to have a predictable temper when doing so many different things, like tapping threads into stainless steel shafts and just when you are finished and removing the tap it breaks inside the shaft and you start again ...........
I think I will need another 2 weeks to get it up and running....