I'll go with the longer forearm idea, that and a vertical grip will help balance it with the can.
Will need a tac light of some kind, and some folding backup irons.
And then some commemorative engraving, a Mardi Gras mask on the side of the mag well, and some green, gold, and purple spray paint on the rail section covers. If you're going to call it the Spirit of New Orleans, you have to pimp it a bit.