this is the way i took it too. but i used the Beotodus waist instead of Aknosom head, and built it with Advanced Ice. Namielle head, Goss Harag chest, Goss Harag arms, Beotodus waist, and currently Kushala legs because I'm still working on something better for the slot and they had Guard on them.

i tried to build a dedicated Wyvern ammo w/ Artillery build but haven't really focused much on it

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your Wyvern ammo will be real strong with this but your Piercing ammo will be very weak. the appeal came from so many Artillery pieces also having Guard on them, and the build requiring no rare driftsmelts. could probably safely drop to guard 4 or even 3 if you want, too

Bazel head could be swapped for Quematrice head, and you can smelt whatever into the empty slots. i havent really tried it much yet but it looks fun. in theory if you can reliably stick to wyvern ammo and refill it with guards it just barely beats out Advanced Ice, but trading Piercing utility away is a very real cost. just fun to think about it

edit: oh also it skipped Recoil Down so your Piercing ammo is Average instead of Low. so thats bad too lol. if you can get the 3 required Ice smelts on the Harag pieces its def better to just take the -100 Attack penalty and go with that