Now I know what I'm putting on my Christmas wish list. A disk sander would make sanding all those pieces to fit faster and more accurate. It'll make all the ends nice and square. Yes, now I gotta have one.
Here is a 5" disc sander that I bought at Menards a few years ago. Two things I like about it: It is variable speed with a knob on the side. And, more importantly, it does not slow down when you feed stock into it. It maintains RPM. The one I had before it would slow down. Here's the link to Menards. More tips and resources for foam board R/C modelers on my blog. https://foamboardflyers.com/