Hey Linton, it's only on top of the current metalwork as I wanted to keep the original tank and it would have been too costly/time consuming to chop it out and redesign it. It's more just a handy mounting area for the fuel setup and the easiest way to section off the fuel from the cabin for CAMS
That is an AWESOME VW mate, absolutley love it! Be sure to put up some more pics when she's done