Steve,Welcome to the forum! It will be great if you keep us posted on your progress and the results - with some information through the coming seasons on its use ... Yes, that would be wonderful .
I have a sunshed - and I'll call it that and you may decide that name fits for yours. It is far more "utilitarian." Simple design that I threw together on a piece of graph paper about 25 years ago. The south wall is UV-resistant film and that doesn't contribute anything to its looks.
One bit of advice that I have is that you should think about the amount of water that plants require, even in the early weeks of their lives. Flats and pots have to drain. So water is applied and it drains away. Perhaps a sink would be all that is needed under a bench holding the flats and pots. Perhaps an additional sink for somewhat more conventional purposes such as for filling sprinkler cans.
Yea, one thing I’m a big fan of is having the right tools for the job. Before I take on any project, I see what tools I will need to make life easier. Speed square is a must and I have the 7” & 12” version. Great tool!