Grendel; I got to the point shown and then stoped because I did not know how to fix the red circled areas. I also learned not to add too many lines to an area (ie. around the eye piece) until I had worked out how I was going to carry on - too many points to move and not the right areas flat. I havn't worked out how to do the eye shade yet. I probably will start over rather than try to fix this model.

Thanks for all the helpful advice,
H. Davey