Sizing it won't make a difference, because the amount of polygon's should remain constant no matter what size a model is, if it is simply scaling that is.
And eh I like your cherry b
om idea, it's all very clever.
but i mean, totally animated, the principal canon should move too, and marioDK, i keep repeating myself with this, but u make ur final smashes too short...
give it a few seconds to prepare, even if those seconds the screen is frozen to avoid ppl hiding, its just for the FS effect it should have... right now it looks great as a working move, but it doesnt have the epic feel a final smash should have, looks more like an overpowered regular attack...
my points in how to make the FS better are:
1- make an intro animation, where geno moves around preparing to transform, instead of instantly becoming the cannon and attacking.
2- the canon should have bones controlling the following parts: a main bone, of course, a bone that controlls the rotation, which is already done, and a bone that controls the inner canon, if u look at it, it looks like two canons merged, that has a function, before shooting, the inner canon should get a bit out, and when it shoots, it should be blasted back inside.
3- make the FS punishable, when he finishes, u should also make an ending animation...
maybe 2, one for when he hits someone, and one for when he doesnt...
those are my two cents ^^
He's trying to stay true to the move in Super Mario RPG, I'm not really seeing what's wrong with it if I'm honest. But I see your point.