Great article and clearly indicating why that little beastie did not make its mark on the aviation world. I agree though it looks a great static exhibit!
The Autogiro [autogyro] was an important step in the development of the helicopter but it was best left where it was in 1939.... halted by the war .... and not ressurected.
Unfortunately it was revisited by several small manufacturers as the supposed 'uncrashable' rotary wing solution and the J2 was just one example. Another worse example was the Thruxton Gadfly [ see
https://en.wikipedia.org/wiki/Gadfly_HDW.1 ] which was truly awful ... akin to getting 1 ton van in the air. The Air and Space 18 was perhaps a better attempt [
https://en.wikipedia.org/wiki/Air_%26_Space_18A ] but even that failed to sell in any numbers.
Why have a machine that is not a helicopter if you can have the real thing?
There are other much lighter solutions but as soon as you try and turn them into machines sporting a grown up cabin it loses all sensibility. I noted also that as soon as they fitted a cabin to the things they got all important and decided that they could put a Police or EMS sticker on the side and undertake the role!!!! Case in point he Polish/Malta Xenon .... I think they sold three police examples into Africa.
Wallis had it right, if you want a gyro go minimalist and get out there with the wind in your hair.