I contacted Eric at Diysoundgroup about sending in one of theirs.l He mentioned possible the HTM12.
https://www.diysoundgroup.com/home-...-series/home-theater-monitors/htm-12-kit.html
The make a good effort to do quite a lot of measurements.
http://www.hificircuit.com/community/threads/htm-speaker-kits.609/
I'm coming into this late, but I was talking to Amir today about measuring the speakers I built, while handing over some surround processors to test- I didn't know about this thread until now. I built three of the DIYSG Titan 615LX, from the baltic birch flat packs, and would be willing to drive one over. They don't fit the original criteria (about $700 each with flat packs and are huge), and I never finished the outside as they are hidden behind my AT screen, but I'd love to know how close they get to JBLs