thanks for the comments greg and peter.
good to hear from someone with first hand experience, so thanks for putting your experiences down Peter. your setup looks great, and interesting to hear about the fov issues and potential flexure issues with mirrored scopes.
I think for time effectiveness and difficulty i'll aim for a second mount esp considering I'm going mirrored and ... at best perhaps throw a small refractor on top of each one ... eventually
if I ever get an obsy up and running. fingers crossed for end of 2016.