Never seen it.
Bavinger house indoor pond kinda meandered. It was open and you had to use stepping stones to cross it to get from the living area to the dining area. Have a picture somewhere of me and cousins my age playing in the indoor pond with toy boats.
The house is not in any way wheelchair accessible. Don't think it could ever be kid proofed, however my 2nd cousins grew up in the house without hurting themselves permanently.