This is what I had come up with for the fuel-dot on my Corsair (note the pic is with the fuselage upside down). I cut one of the included weight boxes to the appropriate length and fastened it to the side of the firewall, and mounted my fuel filler valve inside the box. This way I was able to keep the level of the fuel line where it should be to prevent siphoning, and also be able to access it with the cowl on. You could use any fuel dot you'd like in this manner of course... also, I made sure the front "door" on the boxt fits tight but is still removable in case you need to get inside. I also secure it with a rubber band as well to make sure it doesn't vibrate lose during flight.
