Warbird,

That is a great looking boat! The squaretop just looks right. Have you considered a full batten jib? One of the reasons a H16 is such a reach-monster. I love projects like this.

Also-
You might want to consider a Hooter type sail. We plan to use one on our next boat and it is an old flat reacher from an E-Scow. Looks like a genoa more than a spinnaker- so fast at tight angles. Roller furled for ease of handling.