As with most things theres a thousand ways of doing it ... this just happens to be the way I tackled this project. I learnt alot while working on it and enjoyed it immensely. I look forward to further developing it to improve the design to be the best it can. After two field tests and a few modifications already I'm very happy with the results and if the last Mars shot I posted is anything to go by it's been well worth the effort...finally I can get some dew free imaging done.
PS - I'm now a 17mm T4 Nagler owner Woohoo!!!!