Ciao Planko!
I have a brother who lives in SF so .. when next there I shall endeavour to visit San Carlos and check-out the museum. Sounds interesting.
On page
90 there is a photo of Stanley Hiller standing aside one of his prototypes while his wife Carolyn is in the hover being taught the trade .. and on page
91 there is a photo of two crew from the Hiller factory having left the cockpit (in flight) and sitting on the engine tray in an effort to demonstrate the craft's stability!
Astonished to learn that the Hiller 12 is still being produced.