That's a real tough one!
I think it would actually be easier to replicate a Singer than a Canadian contract 1911 because the bluing was of such high quality during those early years of production, and the Colt has many more rollmarks.
You could probably wipe a Norinco of all markings like suggested above and work from there. As live4therut suggested, Pocketfisherman is the expert on this sort of thing.
The key part in pulling this off would be to use a really high blue for the slide/frame and then some other method of bluing for the small parts to simulate the "smokey blue" that Colt used for them on the originals.
You'll also need a nice set of wooden double-diamond grips.
If you were really into it, you could have your name or your favourite WWI Canadian Officers name engraved on the slide, that would really give the 'look' from a distance.
Good luck - it will be a long road ahead to pull this off so please keep us posted and if you really do a sweet job on it don't forget to add 'replica' under the grips or something for when it changes hands many years from now.
And don't give up finding an original, they are out there! Not everything is priced the same way as on CGN, you never know where you will find one of these, maybe even at the local gunshow or grandmas closet
-Steve