Sorry its taken so long to get some pictures together. Sorry also for the quality of the pics and state of the boot!
The platform was made from 9mm ply (I think it was 9mm, though may be 12). As can be seen, I added a brace to the underside, to improve rigidity. I also sliced a section off and joined them with a piano hinge, to make an access flap to the cavity beneath the platform. I then covered the whole thing in black baize, glued with PVA.
The side supports are simply bits of wood fixed to the side panels with self-adhiesive velcro, so they can be easily removed. They rest on the raised bumps along the sides of the boot floor, and cut to be level with the front lip and rear support. The rear of the platform just rests on the raised trim at the rear, and the front rests on the lip, just behind the raised section at the very front of the boot (does that make sense?).
First: the finished article in situ:
This shows the flush finish at the side and front of the boot:
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