If you can get your mitts on a 1909 Argentine action, they already have a hinged magazine floorplate - and are generally considered to make the nicest sporters, as they are muchsmoother internally/externally than most other Mauser 98's.
I had a 1909, nicely restocked & rebarreled to 7x57 from the 7.65 Argentine - but have seen some that were simply rechambered to .30-06 (which I personally would never shoot).
.
