Your lack of anyone to contact for a demo with the SCR gear is similar to my experience at an event at the Triple Tree Aerodrome in SC where I had an SCR station installed in the racks mounted to the completed bulkhead (but not in the plane yet), and a BC375 with BC348 up and running, associated with the B17F rebuild project I am involved with. I had made a schedule with a buddy to work for on air demos, but that failed.   In our building, we had a fellow with a working B17 top turret and he had some big switching supplies to run the amplidynes.  Those PS's  ate my lunch with hash.  The highlight was a lady whose grandfather was a B17 radio operator and she had her husband take pictures of her at the controls of the BC375, keying it up and transmitting.  She had a couple pix of him in his aircraft, so it was a connecting moment in time for her.  As you observed, people are amazed that this gear is up and working.  They are so clueless about the war years technology, they just stand in awe asking a lot of questions.  I always tell them it is easier to fix this 80 year old gear today, than it is to find the parts to fix a radio made in 1980.

Charlie, W4MEC in NC