The tank I made looks the same general shape as the Brodaks mentioned. Feed tube exits top sheeting, and a pressure tap vent exits near the forward inboard top corner angled to the front at about 45 degrees. I tip the outboard wing down to fill and let it overflow out the pressure vent.

If I had to do it again, I'd add 2 more vent lines for fill/overflow (capped after filling) so I wasn't always removing the feed and tap lines to refuel.