It is a massive job to tool-up for a range of FRP boats, re-inventing the wheel seems unnecessary, it would be better to adopt existing designs that are proven for the task at hand, and perhaps looking to buy existing moulds.
You may want to consider SWATH or hydrofoils for a smoother ride.
PS I forgot earlier, I've also ridden in a few Zodiac 1010's (Canadian Navy) with inboard/outboard diesels.
No porpoising of slamming there either, but not overly fast either.
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