thanx now ive got my thinktank started, time to nut out some ideas... i also want to minimise space waste and im thinkin of going gas convertion (arent we all) so maybe when i finish this stage the tank for the gas will change everything.... well thats life for ya

This is what i meant, but i want to stick the amps in there and then make it possible to lock the seats back

 

 

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I see what you're talking about now. You might want to try removing those panels anyway, to give yourself a tiny bit more room. You may be able to make some kind of trapazoidal Install, where your sub is back and in the centre and the two amps angle outwards towards the opening.
.........Seats
===============
...\ a...................a /
.....\m...subs.....m /
......\p======p/
........back of box
.........Boot Space

I wouldnt bother going gas, the goverment will get their taxes im sure! besides the gas quality has gone down in the past 10 years...