Ursula is a low-profile 5-column split keyboard by u/jamesmnw.
KBD.news Published August 11, 2022
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The Ursula by jamesmnw is a versatile split keyboard "designed to meet a wide variety of needs". With nrf52840 microcontrollers, light, linear, low profile switches and a compact but sturdy case, this Ursula makes for a great travel board.
It has existed for well over a year in one form or another, but I have been a bit reluctant to advertise it widely – jamesmnw.
According to James, the design has "a ridiculous thumb fan. 5 keys."
You can put encoders on the innermost tuckie or above the home thumb (or both with the right microcontroller).