FWIW I was shown a .303 Enfield sporter a couple of years ago, that was built on a Cno7 1944 receiver.
I passed on it. The combo did not appeal to me for some reason, a worse bitster than usual.
No idea who built it up but it looked fine.
There are plenty of Cno7 receivers floating around, I know someone who has some, know others than have others. The problem is finding barrels and the other specific Cno7 parts.
I really think someone should produce some sleeved to .22 barrels from shot out .303 tubes.