Ross,
The tanks aren't quite finished, I've been waiting to sort out the filler necks before finishing them up. I want to make up the mounts to locate the tanks, then mate the filler neck to the tank with a rubber hose.
BDA,
The duct on the RH side feeds into a yet to be fabricated cold air box. I've started on a transition piece that goes from the rectangular opening to 4" round so that I can run a hose to the air box. The duct on the LH side just dumps cool air into the engine bay.
A friend sent me a write up on Lotus 47 modifications that was written sometime in the 70's, and the write up mentioned the RH duct and cold air box, but nothing for the LH vent.
Rod