Very nice rifle!! From your pictures you have an original as it left the service 1945 Canadian No. 4 T, it is not factory original as most '45 Canadian T's are as most were never issued, but this makes yours more unique! If you want to see a factory unissued girl, check out Badger's in the Knowledge Library (
Milsurps - 1945 Enfield No.4 Mk1*(T) Long Branch Sniper Rifle).
From what I can see the original factory parts of your rifle are the receiver, butt stock, scope mount and scope. The replaced parts: chest, scope can, forend, front and rear hand guards, bolt, rear sight, front stock band, butt plate and front scope mount thumbscrew. The receiver of your rifle as also been painted during rebuild but the scope mount pads escaped being staked.