I understand your concern.
I got the engine mainly because I want to upgrade later. It is not that much of a problem to swap the boat, but if the engine is too small for the next bigger boat it seems costly. That being said i could imagine a 4m as an option, just thought I don't need that much boat at the moment. But as you say it it makes sense. Maybe I will later look at a 4m zapcat to have sth. different that makes use of the engine. And some day hopefully a RIB of cause.
Regarding the engine (2stroke) I can easily limit the throttle to less hp, and reduce torque with a higher pitch prop. then I have a 15hp with 20Kg ballast. I will start slowly, promised
I am not hunting for speed records. I know this boat is not made for it.
My question is also not how to make this boat ready for high speed.
As I said I want to make myself a seat and a console. I would also do this with a 15hp engine. Now my question is just: is it better to put each on a separate floor panel without any influence on the rigidity of the boat. Or place them in a way that the panels are stiff together? Would this make the boat better (more stability, the tubes do not have to hold bending force) or make it worse (increased stress on the collar of the tubes).
Especially: does the front triangle have to flex?
I do not want to make a crazy boat beyond its limits
No worry about the mechanical stuff, i will have everything reasonably strong and modular and with my means transportable. Otherwise no point in doing this.