Hve you done anything about your front down tubes yet.
From page 2:
It's my understanding that the spine carries most of the load, not the engine cradle. Reference the stock Ninja frame that doesn't even cradle the around the bottom of the motor - it's just the spine (well, split spine in this case?) and the stressed motor.
Unless I find a stress fracture somewhere - the tubes aren't going anywhere. I'm very confident in them. I know the welds are ugly, but I'm sure they're solid.