So I've decided to build a rocket out of some hunks of spare PML quantum tubing and fins that I have hanging around. I'm gonna reinforce the qt with a full length phenolic coupler from the upper centering ring forward..and I'm thinking about fin encapsulation with foam . Never done it before what do you guys think? Foam or go with regular epoxy fillets? I'm also trying to decide between a 54 and a 75mm mount again any advice?