I'd probably start with some L brackets mounted to the floor at either end then id also either tap some holes in the metal inner part that seperates the boot and the quarter panel or weld a nut to it. That should give you something to mount some timber too and then youll just need to decide what bolts to use and just get the holes lined up right.
Just remember if you cut anything metal you should probably coat it with some paint to stop it rusting.
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