performance report for fatty boom bah!
it worked fine , but..........
after 3 hrs on the water I found it was dragging the stern and was very slow to acelerate.
I blamed it on the wind dropping, but when I wam the board back across the dam and tried to carry it to the trailer I could barely pick it up the stern was sooooo.... heavy. when i stood the board on end water started squirting out of about 6 pinholes in the bottom

I should have put that extra coat of resin on after all.
all up the board had put on ahout 10kg.
then I noticed that one of the foot straps was hanging by 1 screw. it was the 1 strap that wouldnt unscrew when I was working on the board.
the tekscrew that was in the hole( previous owner effort) had pulled out leaving a cavity I could stick a finger into

so a few repairs and its back to the water
performance wise the board was great and the early part of the day was spent with a 2.5m trainer then later a 4.5m sail. the board worked just like the one in safety bay.
If I was building another ( the next will be back to wheels) I wouldnt bother with a swinging centre board. I ender up using a simple straight blade that fixed in from below. so you could make a much simpler CB box or just a fin box from another board , as somebody else suggested