I have been using a "Mouse" electric finish sander to speed up in making parts fit, verses using an ordinary hand sander. With 220 grit on it, I can also sand joined sheeting quickly, without removing too much wood, making sheeting weak.
You might want some of the spring clamps that you get at Harbor Freight, about $3 for a tube with about 20 of them in there, of different sizes. Very handy to hold parts while the slower curing glue sets up. With the warm weather, watch out for the 30 min. epoxy, it will tend to set rapidly. If you do a wing, where the fit is more critical, get a small batch of 1 hr epoxy, just to give a little more work time.

Good luck!