Good points. Though it looks like the outboard would hit first if it was at speed. The foils would have to be easily replaced too I would guess. But, would be nice if the also folded up into the body if you just wanted to operate in slow speed and for landing on the shore.Looks a bit like a bathtub on stilts.
Seriously, cool concept. But I wonder how it performs when the water isn't glassy smooth, or a bit of kelp gets tangled around one of the foils, or a foil gets dinged hitting that bar you forgot about.