Hey Garry.....
As I remember, the tap sizes needed are 2-56 and 4-40. If you have trouble finding them locally, they are available mail order. I realize that shipping will cost more than the taps!
You are correct that the flaps require special attention to detail. The sequence of tasks are very well thought out, and when followed closely, ensure trouble-free scale operation. When you get to that point in construction, and have any questions, we'll go through it step by step.
I do not know of any operational canopy out there. As the engine bay hatch serves to hold the canopy in place while in flight, I think it would require some engineering to make it work. It would be very cool!!!!!(but maybe better left to another project)
You are right about the pictures. The manual leaves nothing to chance, but I urge you to take as many as you can during construction. If anything, they can go into your personal library for future reference, you never now when you'll need them again!