RE: New SUP boards.
No replies since your question was posted yesterday, so I thought I would offer a direction that might provide some interesting information to consider. Hot Sails Maui has a forum at the following address that is dedicated to longboard surfing and sailing.
It might be short on direct answers, but I found it worth the time and effort to cruise through the posts. Also, from what I understand, Jeff Henderson of HSM has played an important role in promoting longboard sailing, and from what I gathered, he had some connection with the development of one of Svein's SUP designs.
Lastly, I would also recommend taking the time to check out Giampaolo Cammarota's blog at the following address. He has arguably been one of the leading trendsetters in longboard sailing on Maui.