I'll have inevitably to defer to convention and add a 'vessel' if only because batteries and electrical equipment are decidedly averse to contact with salt water.
A benefit is ~ despite it being at risk to holes beneath the waterline ~ it does marvels for the volume of displacement and thus the payload.
And allows us to stand around with tots of rum saying "She's a fine vessel, sir, and no mistake...".
Another benefit is that the pontoons need no panels for displacement or else to form a shear web, because the box itself provides for both functions.
There'll be a lid of course and ~ should it ever be crewed ~ you've a ready-made coffin for those burials at sea.
On a more serious note, expect to see as many of these things flying around on water as there are currently in the air over Europe.
A good while ago I spoke to an ex-RAF pilot who runs a company making drones that the the RAF itself has tested as a means of launching missiles.
His opinion was that WW3 had broken out already, but that most people in the UK had not yet caught up with the fact: a phoney war like that your grandparents experienced.
Have a nice day.
