Mike,

Just some ideas:

1) Will the wing dowels interfere with the tank and foam wrap? If not, you could glue two triangular hard wood pieces to the corners of the former, to which screw the cover (the wood screws that hold my hatches keep getting loose with vibration and falling away, as well as crushing the balsa cover).

2) You could also hold the hatch cover with the dowels of the wing, by gluing a piece with two holes.

3) Four recessed micro magnets can also been epoxied to the cover and fuse at the rear end.

For any solution, the edges should be sealed with some foam or silicone, in order to avoid oil infiltration.

Most important: consider that your full tank will weight 10 times more during any 10 g maneuver; hence, a full 8 ounces tank may force against the hatch cover (or your platform) with a force as high as 5 pounds!

((0.79 x 8) oz nitro + 1.6 oz tank) x 10 g = 80 oz = 5 pounds

Regards!!