I understand your desire to try and replicate an original sporter but your project will never create a true original. For practical use I personally would go with a recoil pad, a Silvers or a red Pachmayr Old English if wanting a little bit of period correctness.
I have an original Oberndorf Type A Mauser in 404 which was fitted with a ventilated pad (in Africa I presume) but I have since fitted a red Pachmayr pad to it. Much more shootable than a plastic/horn/steel butt plate. Went off them in a big way when shooting the SMLE 303 battle rifle with a brass butt plate as an army cadet at High School.

Your Mauser logo plastic plate will fit the bill though. Please post some photos of your project.