Hello out there in Mauser-land

I have 2 original single square bridge magnum Mauser actions.
I am goin to sell one and build the other, or I am just build both.
However, both have slant boxes for rimmed shells. One is factory engraved on it’s front ring “350 Rigby Magnum”

I barreled the other one in 9.3X74R because it’s so close dimensionally to the 350 Rigby, and it didn’t require me to modify the old action at all.

My question is this;
Does anyone out there have a picture or drawing (even just a hand made drawing) of the cross sectional view of the inside of the inletting around the slant magazine? It’s obvious that such boxes could not be inlet to super close tolerances for and aft, or there would be no way to align the guard screws. I have stocked a BUNCH of Mausers in my life, but these are the first ones I have ever had with slant boxes, and I have never even seen a drawing of how the factory inlet them, let alone had one in my hand.

So, is there anyone out there that has a slant-box rifle that could show me how they were inlet into the wood without weakening the wood behind the box? Mausers (and all bolt actions) will try to flex outward during recoil at the magazine area, and that’s why cross bolts were used. Was the use of cross bolts the only way to reinforce these stocks with slant box actions?
Please help if you can
Steve Zihn