On your assessment of "Sweep"... you are right... there is really no sweep in this wing. There is about a 1:3 taper, so the spar it straight.
Yes... the heat shielding is just aluminum tape. As far as using it on other models... I use it all the time. It's on the belly of my shock Jet... it's on the underside of the elevator on my Falcon... and I use it internal on other models to protect wires, and fiberglass.
I haven't measured the flaps yet. They go down to a point where they start to bind. It's roughly 50 degrees. I'm guessing 15 to 20 degrees for take-off. But once I do a final "Set-up".. I will check the angle of the suggested movement.