Sub box idea... thoughts?

[DFA]

Well, I finally got around to doing all the wiring and setting up my RF P3 shallow sub, and it's being powered by a TMA 500.1 amp, which I just threw on my trunk and have been testing for about a week.

I realize driving around with an unfastened amp (and sub box) is a general hazard, so I thought about just ditching the hatch false floor and the side boxes under it, and just make some room for the amp and some tools, together with the sub to stealth it up a bit, and have my trunk more organized overall.

What I have in mind is a box the size of the hatch false floor, with a little compartment for the amp under a hinged 'door' with fans on it to keep it cool, and another compartment on the right for emergency tools, bottle jack, etc, and of course a 1cu.ft space (reccomended size by manufacturer) in the center for the sub to go in. I haven't gone out and taken exact measures of the hatch for this, right now I'm just brainstorming.

I sketched it up real quick to have an idea, here it is:



Big circle is the 12" sub, and the smaller black circles are 12cm fans. All of this, of course, will be nicely wrapped in black carpet.

I have a question tho, Is there any way to power the fans from the +12 line going to the amp, instead of having to power it off another +12V line somewhere else? or would this just equal an instantly burnt fan (and fuse)?