I bet a BSA Ultra with an LDC or shroud would be a sweet little gun.
I forgot to mention in my previous point that I have my 5 fpe B51 pretty much sorted out mechanically. Now I need to put lead to paper and accuracy test in my basement.
I had initially bought 3 new old stock B51's to start modifying. While I was trying to complete the first, a 5 fpe project rifle, a B51 and a B50 showed up in the classifieds. I just had to give them a new home. :-)