Focal Mezzo Utopia Be Upgrades

That's a tough call.  Used Mezzo are trading between 4K and $5K.  I am not sure how many would be willing to drop $3K on a tweeter update even if it did translate into better sonics.  The modded Mezzo would have to better "other" used speakers that are selling for the sub $10K range to justify the upgrade cost.  I enjoyed my time with the Mezzo and I liked the sound of them in stock form.  Good luck with your adventure, I wish you success.

Yes, I am confident they would exceed the performance of 10k speakers after mods. :) but it's not worth doing 1 pair.

Erik, that's the issue.  You are essentially asking for others to help fund your project.  I mean no personal offense, but if you had a reputation as a first class third party speaker modifier, perhaps then someone may take a calculated risk on your modification based on your track record.  I see this project as a perfect example of a Catch 22.  I hope this gets off the ground, because I will follow its progress with interest.

Yes, the cabinetry on the Utopia line is absolute first class.  You picked a speaker with good bones!