Looks good but there's only so much you can do with CAD. Start cutting up some wood!

Some people like to get every little detail of a design sorted out before they start work. I don't! I make one piece then make the next piece fit to it, and so on tweaking the design (in my head usually) as I go on.

e.g. Although I have made the front and rear standards and temporarily fitted the bellows, I still don't quite know how I'm going to do the focusing rack. I have a few ideas in my head. I will probably have to try them out firs, possibly with some MDF before I cut up some more oak.