buoyant force expirements: forcamaran, floatingisland, funnel, hovercraft

Hi,
I'm very new to 3D printing but yet very fascinated about it.
The S.T.E.A.M make it float challenge is interesting and challenging so I’ll try to design a boat that can carry as much weight as possible in comparison to its own weight.

All in all I created 4 designs to be able to exploit all different physical phenomena of the buoyancy.

1.Forceamaran:
Body:
I started with a really simple structure to be able to test, how much a simple 3D print is able to carry.
On the bottom t