two for the price of one,maybe..?looking at cutting this sail and making a 4mtr[aprox]luff side and a 3mtr[aprox] leech side.mast laying on sail is 3800 long[40% carbon 25 imcs]i stuffed up the cuttig of it initially and then changed mast base on buggy so now it has a 530 ally tip to bring it up to 3800.from previous posts i think it is prob stiffer than ideal,both sails would have a foot length of 1300.[close to your rec specks Paul]top of the luff side batten is 600,leech side 400.
torsional frames and softer masts have been mentioned in previous posts and could work against me here.not sure about the 3mtr option when i am only going to get a 4mtr.still like the idea of the square top sail and pushing the limit to around 5mtr and just make the one sail[picture the mast at an angle to use complete top batten]from previous posts while all that extra sail at the top is considered by some to be a waste i have read that the sail twist can provide a more forgiving ride.
dont know iff you can tell to well from picture but i think i might give it a little more mast rake as well.
p.s.just had another look and if i go for the larger 5mtr option[square top to use all top batten i can still get a smaller sail by bringing mast down to bottom of sail .