[Funny]

I never knew such a beast existed! Very cool, and looking forward to more pictures. Perhaps a video? Loud? Will you need hearing protection? You said the right hand motor took a lot to get going? You should rebuild (or at least clean up) all of the motors so it runs nice and smooth.
And if you want to sharpen the blades, they sell at most True Value Hardware stores a blade balancer that kinda looks like a top, but upside down, that you balance the blade on while you sharpen it with a Dremel. A sharp blade cuts off the grass, a dull one beats the grass and tears it, leaving the tops of the grass blades brown. Good luck Ben!