ExternalTrussWithBalanceSpar

Description

External truss is a minimal-waterline way to provide support.
Balance spar ensures we have some differential buoyancy based on height, for stability.
Uses HangingBallast
Will probably want a [[1]]
Depending on platform shape, can be FractalTiling
Lower hull can be used for EntrainedSeawater
Balance spar also provides access to waterline for cargo, moon pool, etc.

We will compare this to the Dumbbell, since it is very similar.

Safety - Truss support may be stronger than a single spar.
Comfort - Almost all space is on top platform, which means it is in the sun, which is nice.
Cost - Truss support may be cheaper than a single spar.
Cargo - Bringing cargo into external strut area may make it easier to hoist.