Trap door will be accessible with out moving the box the box will be situated to the rear of the boot there will be three boxes or rather 1 box and two amp racks all will be revealed in time I will draw a quick design on illustrator tonight to give people the concept as no one sees my vision haha.

The amp racks and sub will be against the rear seat with just enough room for the trapdoor to be accessed the three boxes will be bolted to each other and to the false floor which will bolt to the boot ; )

This will all be covered with a false wall showing only the sub and two amps this will be black carpet and I will make up some pretty looking framework for the amps and sub and that will be flocked blue to match my interior ; )

Hope that helps.

And there is soft ware for sub making I spent a lot of time at SAE Perth doing my bachelor of audio so did the maybe myself but in the end I had to compromise some of the boxes shape for the amount of space left as the false floor took up room.