Hey Mike Thanks for the cowl. As far as sealing the tank in the boat I would never recommend that. Unless it would be a one time boat. Straightaways or record trials, etc. Seals go away with the nitro content used in the fuels. Air leaks, pressure problems the list goes on...I, personally, would do the side saddle tanks. CG of the boat never moves, the whole boat "airs out" about the 4th lap, still balanced. No -nose over- condition to develope in the later laps when you might need the speed.
I have a Phil Boat I am wanting to get on the water this season. Radio box is in the front and side-saddle tanks. I'm still worrying about the boat being a flyer. I have seen these boats really run. Grim I will also run a OPS motor. May not be the fastest but I have found them to be reliable and quick. "Fast , furious, flying for four laps. Upside down on the money lap doesn't get you points."