I am putting together a plan to build a side hammer BP shotgun for turkey hunting only. I want a barrel that will offer full or extra full choke system, and on my wish list a ported choke built into the barrell.
Not wanting much am I!
I am also looking for someone who does hand forging of side hammer.

Not too sure about the choke... I suppose any cylinder smoothbore fowler and then you could have the end of barrel tapped to accept a Rem-choke or the like.

But these are very nice:
http://www.flintlocks.com/rifles04.htm Smoothbore fowler in 10 or 12 gauge.
www.caywoodguns.com English 12 gauge fowler.

Or if percussion is what you want:
http://northernrifleman.com/tab1/store/category/7vv4/Shotgun_Kits.html

These are the Pedersoli side by sides.

Thanks friend, I will hit these sites for more information.