Congratulations to PyroSporker16 and ZPO4O! I'm at once excited for them and utterly crestfallen that we didn't find it first... especially since I (and others here) spent so much time around those recessed bridge areas in Kikowant Stations. We were sooooo close during the same games where we discovered the "secret doors".... before Marty posted the contest. Ah, well.
One less thing to do... and what a cool easter egg on Legendary!