I found those Whitaker links by doing an image search and then following them to their home, an increasingly interesting way to 'hunt'.

Can anyone explain how the receiver is attached to the forend? I saw a locally gun smithed rifle with a similar concept, wrist removed, and the rear of the receiver had a 1 inch tang welded on, similar to a musket, and a hole drilled and tapped for the rear anchor of the receiver.
It was a sporterised hunter style rifle, for $275? which is pretty good money, and it sold quickly, I gather an Auckland gunsmith had made several and they were well known, perhaps even desired, judging by how quickly that sold.

Removing the wrist on an Enfield would be a very interesting proposition, considering the hours that have been spent discussing its role in an Enfields accuracy, excepting that the designers weren't idiots and would have tried this for accuracy improvements and didn't order its removal on the No4 rifle.
There's almost room for a a whole book on the philosophy behind the design of the Enfield, lol.