Silverado 11' 2400rms Audio build 3" seat lift Fi SSD

[tres5075]

I have a silverado 2011 crew cab Z71 5.3L . Mechman 270A alternator on its way. alpine mrx-m240 (2400@2x1) going to test its true power soon. Pioneer DD with brake bypass. Just finished Big 3 + new battery terminals. 2 Fi SSD D2 12's non high qts (easily take 1200rms each). The subs are still being built. 3" seat lift. All KnuKonceptz 0 gauge wiring and 4ch RCA's. Every connection soldered. Sound deadening. Aftermarket speakers will come later unfortunately.

 

First off, I will be adding pictures monday.

A few questions.

1) I fused the alternator2+battery cable with 250a fuse because that fuse rating was the closest I could find, if my 270a alternator puts out 250a+ would it blow the fuse?

2) Should I searate the subs if I have about 3.8-4 ft^cubed total, and I want them ported?

3) Am I missing anything?