I ended up with a fairly OK used pedal box from 002spares, and rebuilt that one instead. Throttle linkage setup is certainly exciting.
Pulling out the carpet to get to the box, however, lead to a new discovery, and that meant of course I had to strip the rest of the interior to see how far it all went.
So that's rust in both rockers at the front of the doors with adjacent patches in the floorpans, rust along the tunnel to passenger floor pan join, and a large collection of holes in the rear
Fixed the brake booster (non-vacuum hose, no seal on the fitting on the booster, check valve in backwards).
Time for new wheels...
http://www.bmw2002faq.com/index.php?app=core&module=attach§ion=attach&attach_rel_module=post&attach_id=65586
http://www.bmw2002faq.com/index.php?app=core&module=attach§ion=attach&attach_rel_module=post&attach_id=65592
http://www.bmw2002faq.com/index.php?app=core&module=attach§ion=attach&attach_rel_module=pos
Objective: reduce or eliminate the smell of fuel in the trunk and garage.
Materials:
FuelSafe TPV8: http://www.fuelsafe.com/store/vent-check-valves/tpv8-in-line-pressure-relief-vent-valve.html
12" of 1/4" fuel hose
Two 1/4" right-angle vacuum barb connectors
One zip-tie of sufficient length
New, locking gas cap
If the convenient hole in the trunk floor I used is not available, more fuel hose may be required.
Update: after a couple of hours, the garage fuel smell is notice
Pedal box extracted with minimal drama... aaaand I'm not putting it back on.
I didn't shoot the PO's novel accelerator pedal attachment (a sheetmetal screw through the plastic base into the bodywork, plus some glue on the pedal nubs that stuck to the carpet), but safe to say I'm replacing that as well.