Re: Where to mount sail on kayak
Matt, look at the mast placement and attachment system on windsurfing boards. Often you can buy used windsurfing gear for little money, mast (which you would have to cut short), mount and sail. Typically the mast would be mounted right in front of your seat. If you mount it on a crosspiece straddling the gunwales you will have more leg room, otherwise it will be between your legs. Pick the biggest rudder you can find - it helps to steer and stabilize the kayak. Or make an amu from a windsurfing board, preferably with a dagger board. It has to be fairly well designed or you will be in the drink all the time.
Be kind, for everyone you meet is fighting a hard battle.