Get the frame, and transfer all the parts from your bent bike to the new frame, and have fun doing it.
not a Ninja, but I am doing something similar, with my bike, and having a great time doing it
started with this
went to this, and here you can see the dent in the frame
fixed the dent
painted and reassembly has begun
if you need more inspiration, you can see the whole thread and build here
http://www.thegsresources.com/_forum...d.php?t=184389
you will enjoy doing it......