This is beautiful!
I saw the previous sratchbuild too, and want to ask you: how do you glue together different plastic parts/panels under different angles? =)
I just try to figure out how to work with plastic. =)
I've worked with many different materials and wood is the most forgiving material and most wood is cheap. Plastic is the easiest material to work with as it cuts and shapes nicely and retains that shape, but is expensive. As with wood it shrinks and expands so if someone made something really nice and didn't let the wood dry properly or lives in a humid area your nice piece is ruined.
Now to your question, when you cut a specific piece to an angle, make sure you dry fit it first. If it fits well enough then glue with a very fast drying glue,(I use instacure medium viscosity). Use medium not anything under as the glue will stay in place enough for you to hold the piece for at least 5 seconds. DRY FITTING ANGLED PARTS IS #1. This is a skill that takes time so be patient. Dry fitting is the process of fitting parts BEFORE you glue.
I hope this answers you Q. If not be I'll make a couple of pics showing how it's done.