First set of missiles is done, and they seem to work okay!
Even that goofy box fin (four stripes) pretty much goes where you point it.
I think my favorite so far is the tube fin (two stripes). Not perfect, but I like how compact and unusual it looks. It'll need more tape on the inside edges to stick better, but that shouldn't be a problem. Might even control the width better.
I've already got some other ideas to try. Double the tube fins, fore-fins, maybe some tricks to try and prevent folding on the seam, maybe a mock discarding sabot... but I have to be a productive adult for a little while longer first.
More updates as they come.