I'm not really striving for perfect. I just get to a point where I say to myself "this isn't going to turn out quite how I wanted it" or "it would be better if I did it like this".
I tend to start things by building one piece then building the next piece to fit. Very unlike me, for this camera, I have made extensive CAD drawings and I only started to cut wood once I was happy that it was all going to work out.
I will probably finish one of my previous efforts as it was going to be a horizontal 5x7 with a 5x4 reducing back. I have already made the front and back for it and I have the bellows as that was the reason for making it. I have decided to simplify that one and build it as a monorail... but that will be after I finish this one!