sounds like my folks. 1942 mom's family moved back to PA and they met.. 10 years old 4th grade... took a while, but yea they married, 8 years later had me in 1962.
Seriously contact South Bend replicas even if you find a piece somewhere else.. They are the only ones I trust to go over for safety and to make it safe if it is possible...
Also, don't dither with sale models unless you get one sized for the shelf to see after getting a real one.
SB also hears a lot of times when someone is selling and why I mentioned it...Chances are, he'd be familiar with the piece as well.
He's the one that works on the ships arms for Consitituion, Constelation, Ft. Niagara and so many other places and movies.
Do yourself a favor and get an enclosed trailer with a ramp and z track... Put in a couple extra vents like the semi trailers use.
Most the extras Powder box, linstock, rammer, worm, sponge, vent pick etc.. you can make yourself. Just buy leather work gloves. Use a wood or brass bucket for swabbing water.
I can guide you on how to make quills so you all can fire it without relying on det chord.
NMLRA does have cannon certification and classes.