Well I feel stupid. This is apparently the top of the line Pro Alloy tank, and instead of using the OEM fuel sending location, there is an internally baffled center collector, with internal pipes that run to the side of the tank where they are AN fittings.
I emailed the manufacturer to see how I can go about getting a fuel level gauge hooked up since there is no room for the stock one, but everything else will be going back in exactly how it was before. I feel stupid, waste of about 5 hours to get it all out, hopefully not more than a couple hours to put it all back in.