Thanks Dan. Very time consuming as everything including new rear panels has to be custom made (and veneered). I under-estimated the time on this work but hey, I enjoy the work so will learn for next time! The Noble pot values have thrown me somewhat. They don't sum as claimed (by Yamaha) despite cleaning. I'll remove and test the next set and check them.
Lots of work to do yet on the crossovers. Once I have the first speaker back together today, I'll redo measurements, this time for individual drive units and import into VituixCAD to build the crossovers as constructed in simulation. Then it's a matter of fine tuning in sim before revising as needed for best response.