Folks,
The simplest and easiest ply hulls you can build would be deep skinny symetrical bannana shaped hulls.
No c/b and no skegs and bugger all tooling up.

Windrush produced a 12ft surfcat in glass with spade rudders that sailed quite good (even upwind) with this style hull and the kids at my sailing club and some of the parents used to have a ball on them. Sometimes sailing 3 up.

Dead simple to do in wood.
If I was doing it in timber I would glue 2 lengths of ply to a 2 inch wide keelson of cedar.
Halfway up the hull sides would be a stinger each side full length.
Cedar props between the stringers to give only slight curature. (As perfectly flat panels are not very stiff.)
The deck would be sold foam with a layer of glass laminated underneath. Shape the top of the foam to a preset deck curve and a couple layer of glass on top.
This would not only be a deck but also provide floatation.
The way you shape the deck will dictate how asthetically pleasing and modern the boat looks.
I've not done the calcs but my guess would be maybe 12kg per hull. Just a guess.

One off would probably take several weekends but if you set up production line style you would probably average a pair of hulls per weekend.

Quick , easy , dead simple and dirt cheap.

BTW:- As the panels are essentially flat you could build these from any material you like but some materials may need a bit of tooling.

Regards,
Phill