So here is a little information on the new tweeters that I had developed.

The new Neo tweeters use the same frames as the BG Neo 3 tweeters. But instead of a Kaladex film for the diaphragm it uses Kapton.

In the test units the two halves of the frames were screwed together so that they could be removed and reused testing different diaphragm tensions until the desired response was obtained.
Also note that instead of the connection being made with a Tin terminal, these terminals are high purity Copper with a Gold coating.
The response curves look great and very much like the custom tweeters that BG used to make for me.
And since these use the same frames as the BG tweeter they can be interchanged physically.
I'll update everyone on availability as I know more. Please hang in there.