I have a friend who has made some fine percussion and flint rifles and fowlers on a budget. He is an inventive builder, a master tinkerer, sometimes using what I would call junk to make something functional. When I met him, he was turkey hunting with a short smoothbore he made just for turkeys; it had a modern barrel he re-breeched to flint and jug choked with a brake hone, what looked like an old CVA lock, and a walnut stock that was a repurposed modern stock with laminations to fill out the skinny areas.
At first glance his turkey gun looked store bought, he would then point out the parts and what they had once been. This guy was of very modest means, his turkey gun cost him nothing and got the job done.
I had a senior moment once while I was bandsawing a nice cherry stock blank to shape. I still don't know how I did it but instead of cutting the sides of the barrel channel to shape on the raw blank I ran a cut right down the centerline all the way to where the entry pipe woudl have been. This was on a really nice figured blank cut out of storm damaged tree that fell near my garden. I glued the errant split back together but wasn't going to use it but knew my friend would.
I had a 38" Colerain 12ga barrel that was cut off center, I had already had it jug choked before I noticed the off-center muzzle. I notified Colerain about the off-center barrel, they really stepped up to the plate to make it right, the best I have ever been treated by a company that made a mistake. They sent me a new barrel and told me to keep the old one.
I gave the off-center barrel and mis-cut blank to my friend. He made another turkey gun out of the parts; he hid the split in the barrel channel and ram rod groove and made a 40 yard English fowler turkey gun that is pretty amazing.
When I make a rifle or fowler, I want it to be period correct but I do admire anyone who does a credible job on a budget and makes something to shoot and hunt with instead of look at.
My inventive friend can also make any stringed instrument and is an amazing musician, some of his guns may be a bit crude but the instruments he makes look like they were made by a master.