I dont know much about them but if you look closely it looks a awful lot like a short Wolverine. Probably would not take much to convert a Wolverine barrel to a Hawkeye if you had the other parts. I dont think i ever seen one in anything but a 50cal. Maybe a 54cal too but never a 45cal.
I made a pistol from a Knight Disc rifle w/bare primer conversion and thumbhole stock. Only shot it a few times so far but seems like its going to be pretty accurate.
Also have a pistol I made from a T/C Black Diamond rifle w/walnut stock, its very accurate.