I finally got around to removing the cage, interior tub and back panel to get access to the fuel tank. As with many Superlite parts, it's custom made and beautifully TIG welded. The pipe passing through the middle of the tank (you can see all of the way through it in the first picture) provides the straightest possible path for the shift cables... it's a mid-engine car and the drivetrain is behind the driver. It angles downwards from the driver side towards the passenger side.
The first step was to tap five 10-24 holes in the fuel level sender flange... and then start ordering lots of parts to start connecting things.