Sniper's Greatbow & Skirmisher's Shortbow & Arcanist's Bludgeon can't work as sub-weapons
(Doesn't autoswap when you're main on melee weps)
It seems like all the range weps in this mod share the same issue.

@Entitas thanks for picking up other missing sprite lines, I guess we just manually add them ourselves for now.

Gave this a try, it looks like you don't have these pictures defined in your PlayerFileDefs, meaning the items that use them don't have graphics:
SuperThunderRing.png
CritGem.png
CheeseAxe.png
AssassinGem.png

That skirmisher's bow seems like it will be really fun to use. Hope you can make more weapons to promote more builds i wouldn't have considered.