Esky (icebox, cooler) park system. Advice please :-)

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   Hi Guys!
First of all, fantastic forum! So so much good advice!!

So...
I saw a picture a while ago of someone that had built a small system inside a retro esky (one of these) and it got me thinking...

i've done some basic maths on the dimensions given and worked it out to be roughly 1.3-1.5 cubic feet inside. the construction is a metal outer, with about 1.5cms of polystyrene with a plastic inner shell. 

My plan is to make a self contained system with aesthetics as the priority, i like the idea of having something that looks unassuming (and a little bit dorky) but can pump out moderate dB's.

in terms of hardware, i'm thinking eminence 10" (either basslites or beta-10a. links below) a eminence apt50 horn, running through a 2 way crossover probably eminence pxb2 (2.5k asymmetrical), a bridged 150w-200w car amplifier (4ohm driving 8ohm speakers probably) with inputs summed to mono running off either a sla or lifepo4 battery, most likely in the 7ah-10ah range. 

links:

driver
 http://www.eminence.com/pdf/beta-10a.pdf - http://www.eminence.com/pdf/beta-10a.pdf
horn
 http://www.eminence.com/pdf/apt80.pdf - http://www.eminence.com/pdf/apt80.pdf
x-over
 http://www.essentialaudio.com.au/s/en-us/p1009_eminence_pxb2_2k5cx_2-Way_crossover. - http://www.essentialaudio.com.au/contents/en-us/p1009_eminence_pxb2_2k5cx_2-Way_crossover.html

now, because i want to apply the KISS philosophy to this as much as possible, i'd like to avoid porting the box. this is due mostly to the fact that with the amp and the battery sitting inside the box, it will be hard to accurately gauge the internal volume. once again, this is an aesthetic decision, so tell me if i'm being stupid!

here is my preliminary sketchup of how it will go...

I will need to re-do this once i have the correct measurements for the box, but this is a start.

I just wanted to run it by you guys before i start buying stuff, just to make sure i'm not being over ambitious here!

basically, i want to build a system that will be loud enough for me to dj with if i feel the urge. i'm not looking for massive LFE subbass or anything, just something that will make a kick drum punchy and have enough oomph to be used for a bit of a boogie at a barbecue in the park. I'd also like to be able to get about 4 hours out of it at a decent volume (not maxed out, but still listenable).

I've built 12v systems before, but doing it all by trial and error (cooked speakers, cooked amps, police visits and many hours of blood sweat and tears). So this time I want to do it right!

thanks so much for your help!

PS. here's our last 12v weapon. she was fun for a good while!!