Thanks for good info and nice pictures. On the other hand I was today in store and saw all Taylors cutaways were about 1-2 millimeters proud off the fingerboard - so I guess the aim is for flush or in worst case little bigger and then call it Taylor copy...
Sergeis cutaway is insane for sure, the reason for it is that Sergei loves the shoe-like tapered heel but don't like how normal cutaway breaks the look of the heel so he worked out to have sides bend and flow into the heel.
In the store they had also Almansa flamenco thin cutaway (big voice btw, but only 65mm thick!)
They did the heel-side flow such way that I actually really like - they cut the cutaway side short and let the neck heel flow into it - this require a spanish heel neck, not bolt on.
Looks nice, the whole thin body flamenco looks great BTW, but look at the neck and cutaway here:
I want to make one of my guitar as thin body.