I just read through this post - Loads of info!
I want to figure out/get something sorted for mine asap so to summarise options/thoughts to date:
1. Behind the seat tank which fills up in engine bay
This is no good as its spout is in the same compartment as the engine, however may work if the tank was in some way screened off on all sides, and the filler neck "boxed in"
Making a tank just behind one seat makes the tunnel over the top part easier to get around?
2. "Wing" tanks - create a box running down the side of the bug, kind of between the wheels
a possibility but nobody has actually tried?
3. Extinguisher tanks
These might work if mounted above the flywheel or by moving the radiator if there was some way of creating a screen between them and the engine
4. Nose cone tank
Am i right in saying somebody looked into this and the DVLA where OK with it?
Problems include small capacity, needing to reposition the battery and would be quite exciting if you ran up somebodys arse?
In addition, the tank must:
1. Drain onto the ground if burst, and not he able to come in contact with passengers
2. Have a locking cap
3. Have an earth strap (or solid mount)
Where do people find old extinguishers by the way? how much do they hold?