Filler neck questions....

[Bustedknuckle]

I like the location and looks of the stock gas cap on my 1970 but I dont want to have the tank in the cab with me. I want my original gas cap to be functional but I want the tank relocated. Has this been done before? or is it even possible? I would probably be better off just making the cap look origanial and hiding the true filler neck elsewhere but if there is a slick way to make it work I would like to try. If anyone has ideas or can find a thread about this I would appreciate it.