@mkf9901 I also plan on making a Whitworth replica, two actually. I have a 30 MM GAU8 barrel, which should have enough length for two. I'd like to get in touch with you concerning this. I go into Graybeards outdoors on occasion.
@piutesteve Not good, I'm awaiting surgery for a two + year old back injury, after which I hope to "wake up" from pain meds to complete a lot of obligations, including the two Whitworths. I'm having trouble getting anything better than concept sketches, would love to find actual drawings.
@mkf9901 Wow, I also have a barrel and was hoping to make two Whitworths, it is a 30MM GAU 8a from a Warthog A10. I also bought the Whitworth drawings from the same source but details are sparse. I would love to consult with anyone who is building a replica Whitworth or Hotchkiss Krupp breech gun.