He was not interested in a NDA / sole supplier arrangement, he basically wanted me to hand over the design and let him sell the kits directly to customers himself, is what I inferred.
After a while i even offered to do that, but under only one very reasonable condition, that i get the 1st kit as the prototype tester Guinea pig (you know, to verify it works ok and is reliable before selling to the general public) but i didn't get a response to this either.