thanks very much for your input. doesn´t sound like worth the trouble. although as i said, the new ones have fcs-boxes. so no problem to put different fins on the board.
@ kitepolot: the mentioned 6´0, was it fish or shortboard? i can´t find any 5´10?
I'm not saying it is not worth the trouble, but I do think they are not made for kiting but surfing slower waves.
Most of the ones I have tried was the older gen. so maybe they did some updates when they changed the construction to something lighter?