Yea, I sent e-mail to Dave(Sano) and no answer received. Billetware no response too.
The only one who responsed on my e-mail was Darryl from Sik50s(King racing) and how Tbolt says, here is the answer:
"Not right now,there are no subframes available at this time,and the
manufacturer is way to busy to build them,and he is not sure when he will.
Sorry about that."
So tell me now-should I buy RB frame(seems very similar to the Billetware frame), but I like the cradle frame support. But I dont think it is necessary to have cradle support, I will buy RB frame I think...