I have never used landing gear on this plane. I just hand launch it and belly land it on the grass. If you are going to fly early morning, put packing tape on the fuse and wings to help keep the water off the paper. If you want to use landing gear, get some 1/8th inch piano wire or the like (stronger than a hanger) and just fold it and get wheels. But I suggest just belly landing it.
And yes, you can always use a sanding block to help "true up" the angles. I was not good at the angles as well, but over the years, I have gotten a little better. If you watched that first video in teh playlist, you saw that I cheat every now and then and use a tool specifically made to cut foamboard, which has a 45º angle cutting block on teh side. But when I do the videos, I will only use an exacto. New blade of course rather than the chowdered blade I usually use lmao.