I used to make bias pedal boxes and still have the pattern.
A bias box is a little bit illegal in most states but is it's locked with split pins it should pass.
Panels for van are difficult to find unless it fits on sedan mk1 . I found that the rear arch is wider front to back on the van than sedan, not that it's a problem. Maybe buy a sheet and bend up what you need instead of relying on smcka/. taff (no, no) .
Can't remember if you mentioned a gearbox, but...
I have been researching gearboxes from the MX5 family so if this of use to anybody. Our Aust del MX5 from 2001 has a ok 5sp but not the N7 like everyone wants, that's a USA, UK unit.
Power wise the early 5sp box can take about 250-300 on a good day
N7 5sp a little more, maybe from 300bhp,
The winner of the day is the 2014- 6sp which will take 400 plus.
An adaptor plate is needed which I'm possibly going to start producing next year, along with other conversions.
The strongest box on the block is BMW getrag or zf from most models. 500 plus all day long .
Rx8 box is like Mazda MX5, good for about 250-300 , same with Toyota 86 box, since they all are Aisin built.
Anyway have a great Xmas