So where is it making contact, exactly?

Looking at the tang, it looks like it's going to nest well into the stock. Don't worry about that large rounded-rectangular inlet in the fire control group area, as it really doesn't need to be that large. The narrow strip looks like it should match up nicely to the trigger group dimension, and provide improved contact and support for the receiver, better than the original stock, which relies upon the V-blocks to support the action, not the stock.

Personally, a 90day warranty on a rifle stock means nothing to me. 90days on a lifetime doesn't mean much - only really means the thing will fit (given some expected fitting by the buyer) and won't crack on the first shot. It looks like it really wants to fit, so the inlet is correct, it just needs some final fitting. I'd get some bedding black, find the contact points, and finish the inletting myself. Easy peasy.

Gonna be a good looking stock on there once you're done.