The woofer is superb, but the tweeter simply isn't.
Directivity is not that good, and one of my least favoured tweeters because of the way it sounds, I genuinely hate that thing if I'm honest.
So, choosing "as a product" by the measurements and my personal impression of the tweeter, I still will choose one of Neumann over Directiva.
They sound neutral at least, and there is a clear difference between the loudspeaker which is designed by professionals who can design the directivity properly or not.
If I spend on that woofer in my DIY project, I will choose (subjectively) a far preferable tweeter and design a better waveguide for it.
Appreciate your opinion, but think you may have missed the intent of the project. The r1 design targeted just being good and not an endgame speaker. For that matter, the whole project is built around the invitation to do different (hopefully better) designs. While I am not a professional speaker designer, many other contributors to the r1 design are. For that matter, @ctrl has demonstrated technical skills that I am sure exceed many "professional" designers.
If you have a better design in mind, please create a thread and share it. Thanks!