made that sail today, its got a reef to get down to the size you wanted but unrolls to make a nice 3.5m just incase you suddenly find a great place to sail a mini, and strat building a regular landyacht
It will need 2 small battens but they could be made from a variety of materials.once you get it I will put up some photos on how to rig it.
if you PM with postal details I will get it in the mail.
it will be interesting to see how long it takes