Here is another build-detail that might be of interest for some of you.
It is a technique that I use to connect surfaces (depron sheets) that are perpendicular to eachother (it also works with other than 90° angles).
Glueing together two surfaces in a 90° angle often gives not enough stability
because of the small contact surface.
I stabilize these kind of connections with integrated balsa or plywood reinforcements. I found out that CA works extremely good on wood. So I CA-glue together two balsa/plywood strips of about 40x6x1 mm to form a T-shape (the ca bond is ultra strong).
Then I cut a slit right through the depron surfaces that have to be connected and squeeze in the wooden T-reinforcement. Of course you should apply some "uhupor" on the T-piece before you squeeze it in and also on all the rest of the contact surfaces. "seal" the slits with clear tape.
This method increases the strenght of perpendicular bonds signifficantly. It works great and is easy to do!
I hope the following pics explain it better than I can do with my poor english...