I have learned a lot from this forum... and a lot by doing stuff myself. Years ago, my first 3" rocket was put together with epoxy and did fine on 29mm H motors. I really learned lots about good building techniques /light weight / and strength by DOING/building/ making mistakes.
I built and destroyed several BT80 Super Big Bertha's - and in the process -NOW - I know...
- to sand or scuff up areas where I'm going to glue. (makes the joint super strong) (they don't always tell you that in the instructions)
- how to properly make a double glue joint. (the material will fail before the glue joint)
- how to plan ahead and change or improve a few things (elastic... get real
)
- Most rockets will fly higher and go faster on H and I motors (L1) when the rocket is paper/wood and wood glue.
Not sayin epoxy, 'glas, and carbon don't have their place. Sometimes exotic materials are the only/best way to go.
My Leviathan (mid break zipperless) was built with Elmers Wood glue Max**, and I'm positive it will do fine on the largest 4 or 5 grain 29mm motor that will fit..
**(I like Titebond better)