@Nügat the Beer Hall Putz that unit was a prototype. It would have been insanely expensive then, and outrageous today (imagine how many 1961 glass enclosures would survive intact to present?)

There are other Wonderboy units out there, some of them still running on their original engines. They have stick control -- forward, back, left, right on a single stick. Pretty cool, but without the radiophone, glass cockpit and air conditioner.