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I just got some mdf (2 lots of 550 by 720mm, 18mm thick stuff) which fitted in almost perfectly when the ends were cut to fit to the curves of the boot where the catch is (use the carpet as a template). Then just screwed into the bottom of the box through the mdf.
I imagine if you wanted to mount an amp underneath it then youd have to raise if at the front and back with some blocks of 1x1inch proper wood!