Ed, since I don't know jack about FG, and only understand steel a little bit, I think I'd see about a gas tank that works with the hole you have in the hood. Authentic, and all like that. Plus might leave some room up there for something besides the tank and a bunch of frame parts.
Gas pedal? Is this just the VW arrangement sans the other two pedals? Probably not, but if so, then these OEM sort of things are pretty cheap. Cut off the part you dont need and rave on. Likely not that simple. Sorry, don't listen to me, as I don't really have a clue here. Trying to remember my old 356 lash-up. Believe it may have been rod and socket all the way, no cable. Now, that would be authentic, if you could manage it. What you can trust me on here is the following: That rod and socket contraption was a real PITA.