RE: Fuel Tank mounting
What size plane is this? Did you say that?. If this set-up goes inside the plane then wrap it with foam rubber 1/4 inch and then use cable-ties to secure it down to ..those rails I guess. I'm not getting a clear picture of the whole concept. Especially if this a large glow plane. Use the cable ties ( smallest you can find) to secure the fuel tubing that exists the tank and where it fits on the engine...everywhere in fact that tubing needs to stay in place.