I got the water pump and Arrow Shark TS760-Marine starter installed. Way too cool. Starter has worked very well for the first few quick start tests. Fires in less than a second.
The fuel tank fits perfectly with the starter. Had to clearance the motor mount just a bit for the starter motor. Just need to mount the R-One controller and battery. I think I'll use velcro for both, mount one on each side of the fuel tank. If the rails were taller I'd fab a bracket for the controller.