I went to visit John at Bravewood when I went to BK, and he had a lot of guitars on the go. The big problem he has is the time it takes to age the guitar. The nitro has to harden enough and depending on the time of year and other voodoo, that takes about 6 months or so. When you see the finished product, it is well worth the wait.
He does open and close his order books at various times. I would guess that if you are serious and send an email, he will give you an approximate date for something.