Hi Gary,
Sounds like a big undertaking, if you`re cutting the transoms shorter, you might have to move the centreboard cases & front beam to balance the boat. I`m sure you`ll work out the best way to do it. Keep us posted on the progress, ie take pics!!
On the Mozzie weight subject, I weighed my boom, main & jib in it`s sailbag & was horrified to find it`s 15kg, the bag can`t weigh 1kg, so just the sails are quite heavy, bloody mylar !! At least it lasts a while though. I`ll have to look elsewhere for a weight reduction. My blades & boards are very light, blades are obeche timber (like balsa) with 1 layer cloth & epoxy, the rudders are obeche with carbon skin. Stocks are as per the Auzzie stocks, with a fibreglass rod as connector arm.
Don`t know if I can reduce weight by much. I think if Tim weighed his boat in sloop configuration with spinnaker kit he`d find much the same as us, within 5kg or so. I could be wrong, maybe he can enlighten me (no pun intended !)
Cheers
Steve