Gas tank out, sub box in?

[71ChevySS(straight6)]

Howdy y'all! Just curious, has anybody yanked and relocated the fuel tank in their 67-72 and custom-built a sub box to go in its' place? Really want to do this, just wanted to see some pictures if anyone has done it before.

I was thinking something like either three twelves, two fifteen rounds, or two fifteen squares (Kicker Solobarics) across the bottom, with four 5x7s up top and the amp sitting in a cutout on the box (a divit down in the box just deep enough to make the top of the amp even with the face of the box). I really want some bump in my cab, and the door speakers aren't cutting it ;D

Also, where should I run the wiring? I want to keep a rubber floor in it, should it run under the mat along the transmission hump?