Wish my engine bay had that much space. That's freaking awesome!
From the looks of how you mounted the gas tank, I think you're going to need to run tubes down from the top instead of running a line from the bottom. Otherwise, you could potentially have a gallon of gas you can't use if the nose of the ski is up. I've got a whole tube of crankcase sealant if you need to seal up the lines and fittings on the tank.
On a side note, DNR dropped by to put a HIN on my stunt hull today. I thought I was busted when they blew a whistle in my driveway to get my attention down on the dock...after I had finished riding for the day. They were real cool about it though. Didn't seem to care that I was both riding without a HIN and riding without registration. Had a bunch of questions about the hull itself and they couldn't mount the HIN's exactly where they wanted but it worked out fine.