Hi,
To build another gun, I would take a few days and study what type I want.
Fowler, longrifle, plains rifle, the quest is infinite.
After you decide what type, then the style.
What type of wood is available? What type of hardware, iron or brass?
All of the above follow trends, here on this site, and in the black powder community.
Any one of us can have several suggestions, but you have to follow your heart and head.
There wasn't I a great help!
You are probably more confused than before.
Just Google a particular style of gun, and you will get many images.
After you see what you like, the fine fellows here will help you along your way.
That is the best suggestion I can give.
Fred