How about an old white water kayak. Gut the inside and modify the skirt so it becomes a cover. You can get a Perception Dancer cheap
Streamline and watertight.
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We are running SS865's with very thirsty dual 46's. We burned 13 gallons each our last ride out and came in with under 2 inches in the bottom of our tanks.
Granted we burned quite a bit of fuel making the run in/out twice. The first time was a scouting trip and the second time we hauled the fuel out with us. We only had 5 gallon jugs with us so we topped off our tanks and rode with the big jugs about half full all the way out. Perhaps a smaller jug would allow for you to still get your feet up front in the ski or at least allow surf stance.
http://vimeo.com/14852711
a cheap pontoon is the way to go,pull the skis on deck and take your time gettin there,you have,tools,gas,food and drinks on board and dont have to deal with towing anything,or the drama of riding a sj miles and miles to your ride spot,the min you push em off the boat you are full of energy and pumped,if someone breaks down you dont have to tow them miles back in.
We have one here but the motor blew up and junkies are cheap as shiz here,might get it going one day.The only disadvantage to them is keeping a running motor on one more thing and choppy surf they cant handle