Been thinking about it myself.
Designed an easy to make boat,
here's a model I made of it
a semi-submersible, can sail on the water, and anchor under.
Or that's the idea anyhow.
here's the basic measurements
BaseLength 120e-12 *16^8 515mm hydrogen resonance van der walls
HullLength base*7 3607mm
HullBeam HL/3 1203mm
HullHeight HB
HullBeamPoint HL/golden 2229mm (from front)
HullMastPoint HL/golden^2 1378mm ? or ^2 ? 1574
HullBowBeam HL/7 515mm
HullTransomBeam HL/4 902mm
ForeSupportPoint HL/golden^3
ForeSupportBeam 600mm
ForeAka HL/golden^3 851mm
AftAka HL/golden 2229mm
HullForeSide triangle hypoteneus
HullBowSide HBoB/2 258mm
HullBeamSide HBeB/2 601mm
HullTransomSide HTB/2 451mm
ForeSupportSide FSB/2 300mm
AmaLength HL/golden 2229mm
AmaBeam AL/3 743mm
AmaBeamPoint AL/golden^2 851mm
AmaBowBeam AL/4 557mm
AmaTransomBeam AL/7 319mm
AmaSupportPoint AL-AL/golden^3 1703mm
AmaSupportBeam 733mm
AmaBeamSide AB/2 372mm
AmaBowSide ABB/2 279mm
AmaTransomSide ATB/2 160mm
that's enough for one person for a relatively short time,
can increase the size while keeping the same ratios,
20ft is my recommended minimum.