The AI Mast is basically just a standard diameter windsurfer mast so far as I can tell - I made an adapter for the smaller kayak sail to go into the AI mast 'cup' using a section cut from an old broken windsurfer mast and the AI mastfoot glued into the end, the AI roller furling drum glued on at the right height and a Kayak mast 'cup' fitted inside (all these parts were bought from Hobie off the parts catalogue). Works well.
If you wanted to you could even think about installing the AI mast 'cup' into your boat; then you would retain the standard features of the AI mast such as roller furling and availability of parts. It would depend on the design of your wooden boat but, if the AI mast cup can support the AI mast in a bendy plastic hull and cope with the stresses and strains the wind in the sail puts onto that hull (and bear in mind that being a trimaran, the hull has little ability to spill wind through leaning when the sail is over pressed), then I imagine that the same would be possible in a wooden boat with the application of a bit of thought an common sense. Bear in mind, though, that the AI mast cup in the AI is braced inside the boat to the AKA bars - you would need to stick your head inside an AI front hatch to see the set up - it is not particularly complex or 'engineered' (just a couple of more-or-less off-the-shelf turnbuckle supports) but it clearly does the job. All the parts are available from the parts catalogue.
I think that the AI sail is only 5.5 sqm though. For a 6.8 you might need to think about a different sail and/or even a different mast but I am sure you can work that out easy enough.
Incidentally, there's a second-hand but new sounding Hobie Brave sail that nobody seems to want available for sale here in NZ a the moment for NZ$200 - see
http://www.trademe.co.nz/motors/boats-m ... 110621.htmMight be a good deal - dunno what they cost in your part of the world nor what postage/duty might cost but it might be of interest.