ORIGINAL: Boomerang1

Why not both, flush fitting for transport/storage & an easy to find fitting for connecting up a taxi tank?

A fitting for the bottom of the fuselage which is recessed a little so that even the transport vent plug fits
flush or almost flush except for the warning ribbon.

Once the model is ready to fuel take the vent plug out & plug in the fitting that vents the tank & provides the
easy to reach connection to the taxi tank. Maybe make it stylish like the BVM one. The fixture in the fuselage
would need a locating peg as well so the pitot didn't rotate. - John.