I checked on this.
From what RCCL told me, they are made by a private supplier in Italy. However, that was all they would disclose. Odds are they neither want to let others know where they get theirs, how much they paid, etc.
I doubt the beds are really a product that would convert seamlessly to home bed frames and such. The company might not be well able to meet consumer demand. They make for fine sleeping on board though.
In any and all cases, they beat the heck out of the old beddings they had.