I've read somewhere that the project was abandonned ... Seeing how well the ordinary modded bk can play. I'd be curious to test / play with a metal BK.
Kyo would probably sell you one of the BK metal prototypes . . . at a collector's price
But, if you go to worlds, you could ask him to bring one to try.
Hihi, We will see... I'd expect it to play similar to the QSH ... but I probably would be wrong...