Oh man, don't get me started ! I'm afraid it would be off topic for this forum.
A recent build is at this link: http://contemporarymakers.blogspot.com/2012/10/appalachian-style-gun-by-mike-millard.html
Others can be seen on my website: http://mikemeteor.wix.com/mikemillard.
For all you folks who like to make period pieces with your hands, that Contemporary Makers site should be a frequent stop.
Cruise the archives, there's some impressive forging work there: knives, hawks, etc.
As for the longrifles, the hardware, particularly the triggerguard and buttplate, are the tricky parts.
You can buy cast ones all day long, but I'd love to forge my own.
Some folks do - I don't know how yet.
Heck, a few folks even forge weld their own barrel around a mandrel, and hand-rifle it, but it's a labor of love.
Not for many, and dangerous if you dont get it right.
99.8% of blackpowder barrels are drilled from solid stock and bought by makers like me.
I may start a new thread over in the general blacksmithing forum for hints on forging triggerguards/buttplates.
There's a market for that stuff if you have the passion.
/m