Have you looked under the truss rod cover and the electronics cavity cover? Some builders will hide a name, number or other info in there.
The guitar builders that are coming to mind are Parker and Klein, but this is not enough like either of those to suggest a direct connection. It seems like there's a builder of guitars or basses that does a crazy little wing like this one has, but I'm not coming up with a name.
If you Google "ergonomic guitars" you'll get lots of interesting stuff that looks vaguely like this. For example:
https://www.manne.com/news/manne-gui...or-ergonomics/
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