I have a Magnat amp with the following dimensions: 280 x 55 x 502, and two 8" sub drives to fit in the boot. I was going create a similar setup to Chiark's .. but there is not quite enough volume, so I am considering placing amp behind rear seat, and split the subs, placing them in the opposing recess's in the left and right rear of boot (with subs facing forward to avoid phase issues). If anyone has an alternative solution, I'm open to suggestions..
Also, anyone know the max height for fitting a changer under passenger seat ? Will a Pioneer CDX-P1270 94mm high fit?

 

Don't know if this helps but this was my old install(I now have new car and new install)