Here's my choice:

A) I'd pick the 10.57 Meteor. This is the full-sized Lazzeroni .416.

B) While I am generally NOT a fan of needlessly over-powered cartridges, this is one that I've always been enamored with. I know it's proprietary and that makes brass more difficult to locate. Another important reason for me choosing this specific chambering is that it is not belted, something I definitely prefer.

C) I would go with a big Mauser 98 action - Prechtl, Recknagel, Dumoulin, etc. and a 24" bbl. It would definitely be a wood (English Walnut) and blued gun.