Good looking platform, I always like hulls with chines. I would be surprised if you can get to 25knots but its certainly worth a try. I did some similar stuff to junk Cherubs and skiffs years ago, amazing what can be built from a yard full of old boats.
Raking the mast moves the centre of effort aft but it also reduces the max draft of your sail as the airflow changes so if your short on power and not nosediving try raking it forward of your H16 position.
I would try the jib in higher winds first before cutting it down, all that sail area low down is really going to help.
Good luck with your project,
Darryn
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