It is stated in that thread that there were 3 versions:
Original AA for BR1 retained the Dayton Tweeter
AA+ replaced the Dayton tweeter with a Morel, but the Morel got more expensive
AA+ back to Dayton tweeter (perhaps a later version) with a more complex tweeter network.
Dennis says he likes the last version best.
I think that the schematic in that thread is either for the AA with old Dayton tweeter or for the Morel.
Edit: Here's Dennis' page on the Wayback machine and I think that this is the original version that
retains the early production Dayton tweeter. He provides versions for the shielded and unshielded
woofer. Note that, on my system this doesn't render correctly in Chrome, works in Edge:
web.archive.org
I'm looking for the most recent.
They also mention Paul Carmody's Classic II which I think uses the same woofer with a low cost Peerless tweeter:
4th order network on the tweeter, but I like this tweeter better:
Home > Bookshelf Speakers > Classix II
sites.google.com