I owned an Accustock (predecessor to the Accufit stock) for a period of time and tinkered around with it. You seem to have a good understanding of the recoil lug differences.
Regarding barrel channels, I can't say if they all have the same channel or not. Your Weather Warrior is a relatively lightweight rifle and appears to have a slimmer sporter contour barrel. If I were forced to guess, I would say that your barrel will fit most Accufit barrel channels. In some cases, the channel could be oversized but that won't hurt anything and will guarantee a free float. If you were attempting to do the opposite and put a varmint contour barrel into a sporter stock, it may not fit. If barrel fit is an issue, you would most likely be able to open up the channel with some sanding which is commonly done on many types of stocks.
Bottom metal and magazine questions can be more difficult to answer because Savage has produced and sold a number of variants (top vs bottom bolt release, plastic vs. metal mag frame, mag release on the frame vs. on the magazine etc. etc.). There are several good articles on this forum which describe the differences.
https://www.savageshooters.com/conte...Parts-Tutorial
https://www.savageshooters.com/conte...is-and-Premium
Good luck with your project.
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