Just first, disclaimer. SMLE novice here, but six decades plus rifle collector. Seems to me a #4 the sort of thing a really nifty, interesting .308 Win/7.62 conversion. The 'but for', rubber meeting road reality. Bolt head modif, barrel change, feeding & magazine problems... galore. Am I wrong? One matter to manufacture 10K to 100K in production facility & govt deep pockets backing. Quite another matter one/few-off conversions.
There seem clearly sufficient 'donor rifles', non-collectible specimen pool. The, "but for..." as above!

Just my questioning take.
Best!
John