DeBee-
That is a CZ 550. I kept the factory barrel, since it shoots into one ragged hole
Jack Belk is doing all the work, including fitting a laminated English-style stock from Jim Brockman. It's made for iron sights but should work alright with a scope, too. The scope is a Leupold 2.5x Compact in Talley lever QD rings. The serrations on the bottom of the action are factory, and like you said, they're apparently for bedding traction. This particular gun is throughly steelglassed, so it should hold up fine.
I'll give you a link to a post where Jack describes his "worm track" technique:
click here. Nitre bluing it after the worm tracks was my idea, but he's really happy with it, and so am I.
The stock was shaped from a semi-inlet to fit me, including some cast off. The factory stock was actually pleasant to shoot, but it was UGLY.
The rust blue is an interesting story. That gun was STUBBORN! It took 14 coats of Angiers C-13 Swiss Armory rust blue, and then another two coats of Laurel Forge after that. It came out really nice, but Jack sure earned his money on that job...
Good luck with your Mauser project. I'm looking for an '09 Peruvian for a .275 Rigby project right now.
Best,
Joe