And one of the interior photographs of that single completed vehicle shows lots & lots of (temporary) data recording devices in place. (See
That suggests it was a prototype and still in development when it got cancelled.
Since this thing operated in ground effect just above the water, at say
200 km/hr, I suspect that the vibration induced by flying over the waves would have shaken any loose filling out of your head. All the crew stations are extensively padded which suggests the same thing.