may be possible to use this, but you can also put wheels on your catamaran... wont help it sail better, but it's possible.
it is almost 2' too tall and 4' longer in the foot.
you would need to pre-bend your spin pole 2' down to get ANY luff tension. That would place your pole end in the water (i believe)
also you would need an extra long pole & you would probably have to place the blocks on the rear beam to make this work... since the foot is 33% longer than stock.