Well. I got up 'early' to swap out that picture, but decided not to edit the earlier post.
This was done using a downloaded truck and a handmade aerocap. You can pick dimensions off the eyeballed model. The program will give the distance between any two vertexes. Would that be adequate to your need?
Or were you going to model the boat?
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Where are you going to mount the gas struts? Is that the reason for the sail panel at the front?