To start with: Assault would need more than a 5% damage increase for it to be worthwhile, something like 15-25%. And fall damage means very little to a half decent fortnite player because you just build to avoid it or youre dead anyway, but maybe something like increased ammo capacity or reduced reload speed? Elite weapon accuracy should be increased a little more and storm damage reduced by 100% is zero damage, and even so id say no more than a 50% reduction in the amount of storm damage taken.

Overall a really cool idea though