This Instructable documents how my girlfriend and I built a sailing ndrua in one day. A ndrua could very arguably be described as a double-hulled sailing canoe which has hulls of unequal length, the leeward hull being marginally more voluminous. The craft shunts rather than tacks and gybes, so some people will call it a proa. I don't bother with these names much and call it a boat instead.
If you haven't already done so, I highly recommend you use the "view all steps on one page" function.
Step 1: Idea Generation Phase
This step is made easier if you have a few half finished long term projects lying around as I do. The smaller hull here is from a now deceased 4.2 metre proa I built in 2003. The other one was intended to be used for my 6.8 metre current proa project but I wasn't happy with its design for this purpose so it too was available.
I saw these two hulls lying beside each other and half jokingly thought that they could be lashed together to create a ridiculous sailing craft of some sort.
Basically if you have some ingredients similar to these (unlikely), sit them a nautical distance apart and lay some sticks between them. Now you have the choice of either convincing anyone who is around that this idea could work, or just ignoring the laughter and getting on with it.