Hi Filippo.
I've only made the one in Kasha style, but currently have an order for another.
Some things to consider if you plan to make one - the Kasha bracing seems to be prone to dipping/collapse in front of the bridge. To me, I feel that this is due to two main design issues - the lack of any upper transverse assisting in neck thrust support; and the lack of any continuous bracing over the bridge plate or lower to upper bout.
Both a traditional X braced instrument or a classical fan cover these bases. It is true, the requirement/need for this support would be far less on a ukulele than on a full sized instrument, but they are there nonetheless. It is no surprise to me then that the only maker I am aware of producing Kasha braced ukuleles in any quantity (DeVine Guitars), installs a bridge doctor style system in each one. Now to me, a bridge doctor is a rescue remedy for inadequate bracing design or aged instruments, as opposed to a functional part of the original bracing design itself. If a bridge doctor is deemed required from the outset, well, that is not a brace design I personally would be rushing to use.
I'm not suggesting it can't be done or the results would necessarily be poor, just my thoughts on what it would pay to give attention to should you construct one.
As a side, with my current order for one, I am either redesigning with this in mind or considering adapting a modified basic Falcate system to a ukulele in its place. I am yet to have this discussion with the customer! One objective of the Kasha system was to distribute the load more evenly throughout the soundboard. To me, the Falcate system does this while maintaining structural integrity.
Then again, the good old fan system does a pretty good job on a ukulele. Anyway, food for thought and only my opinion.
This is the one I made -
Attachment: JFCUSTOM_TU_BRIDGE.jpg
Cheers.
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