I chased the design spiral on this for 12 months before deciding you couldn't come up with a single handed boat that had an advantage or would in fact be equal to the double handers around the course. That does not however mean there aren't things you can do to optimise a single handed boat.

From the top down:
A Carbon mast is a given. If you look at the new generation A class rigs they are stiffer sideways and more flexible length wise. Given you'll use the main as a back stay anyway down wind these traits would be equally attarcive on an F16 mast.

A well designed String sail would be worth its weight in gold Both myself at the back of the fleet and the winner of this year's Australian Taipan nations used a Landy string sail and we both feel it is incredably automatic giving you time to make the nessary adjustments that would be handled by the crew on a sloop.

Kite. will need to be as flat as your sail maker can make work within the rules if you're going to trap down wind or actually a bit fuller than the sloop ones allowing you to sit in and point down more.

Hulls can have a lot less volume, modern theory suggests that this should be achieved by reducing rocker not beam but you'll probably reduce both to some extent. Given there is no good reason to reduce transom height this will give you a flatter and faster run aft. If you raise the forefoot slightly you should be able to create a hull that has the bow immersed upwind but slightly above the water line down wind without excessive trim (have a look at the AC45s) this will help generate lift under kite but will also give you some reserve buoyancy to stop you going down the mine without adding too much drag.

Centreboards will only need to be 2/3rds the size of the sloop ones as asumming you're going the same straight line speed upwind then the required area is directly proposionaly to righting moment. If you make the boards very high aspect then you can make small adjustments to control heeling arm very easily. Boards can be moved aft a little but don't get carried away as having them forward makes the boat easier to drive if you do get the occasional reaching leg with the kite up, however, if you have the boards to far fwd you put a lot of load on the rudders, this can be offset by rudder rake but the more load you put on your rudders the narrower your steering band will be.

Finally because you've saved weight by building smaller hulls you can upspec the beams and make your boat stupidly stiff.