Before you proceed, I recommend reading the book, The Matchless Enfield .303 No 4 Mk 1 (T) Sniper (2019), by Jeff John
Specifically the section on making a reproduction of the No 4 Mk 1 (T), pages 59-61:
"This is a difficult project requiring a skilled gunsmith with access to a mill and lathe. You face the same problems H&H did aligning the scope with the bore without the jigs and fixtures (which are cheap when making 25,000 rifles, and really expensive for making one). Thames Valley Guns in the UK is the gunsmith I've found who does these conversions. He doesn't export out of the UK, but he has written a tutorial about the problems, and it is well worth reading before expending the effort to acquire all the parts"
The author noted that he installed a reproduction No 32 scope on his original No 4 T sniper rifle:
"Sadly, it is nowhere near capable of zeroing without heroic effort. After seeing how far off it was (almost 16 inches low and 8 inches left at 100 yards), I better appreciated the work involved in fitting the pads initially, and why they were considered "married" and not interchangeable."
...My take is that a specialist on the Enfield platform who is experienced in mounting the two scope pads on correctly is a critical skill. My 2cts.
