Simon,
Good to see it is nearly all done..and now for the fun part, the centreboards.
I have now done/or had done several sets and not hard, just care to be taken.
If you want the way i did mine drop me a line and will send you the details, I am not home until end of next week, (at sea) but happy to help from then, might even get out for a sail myself.
Basically as Tim described it a while back but I use a lot thicker plastic sheet and a slightly easier way of stopping the filler running down the inside of the cases and making a bigger bloody mess than needed.....enjoy either way and maybe we will see you at Wallaroo.
David