Using Windsurfer for blank

Guys, anyone reckon this is worth a bid???

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=2920&item=3685923575&rd=1

No, centre fin, (daggerboard), so it may be a cleanish blank depending on what’s underneth the skin.

Does anybody know anything about these Rainbow boards???