The .45 Carbine stock lug is dovetailed and pinned.
Since I have never owned one, I can't say for sure, but I do not believe the Benke-Thiemann rig required any modification of the Luger. It was attached in the same manner as the Ideal shoulder stock holster, with the grip plates. The main difference being that the grips of the Ideal rig were separate pieces and the Benke-Thiemann grips are an integral part of the apparatus.
Perhaps The very early examples of the Benke rig did require the tapped hole in the grip strap, as Mr. Costanzo stated, and the improvements made by Thiemann eliminated this requirement.
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If it's made after 1918...it's a reproduction
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