Is there some way that this combination might work for a walk-in aviary?:
New Caledonian giant day gecko, Tahitian blue lory, Guam rail, Guam kingfisher, Mariana fruit dove, white-throated ground dove, golden white-eye, bridled white-eye, Tongan megapode, many-colored fruit dove, rufous fantail, Tinian monarch, kagu, red-throated parrotfinch
I seem to remember reading that kingfishers can be very aggressive with other birds and people. I'm also skeptical about the success in housing geckos with the birds because of possible predation. Then there's also the issue of finding them, which I think might be solved by keeping a large group in the enclosure, but that I assume poses other risks.