Has anyone attempted a fully GNU Guile/MIT/GNU Scheme/Common Lisp/Maclisp/etc etc etc kernel?
yeah
John Rahn from the University of Washington wrote a LISP kernel.
https://faculty.washington.edu/jrahn/lisp/kernel.html
https://www.jstor.org/stable/3680790
mezzano
This software is off-topic for this thread, but it's something interesting nevertheless.
It's a computer music system, a Common Lisp front-end to the csound system ( https://csound.com/ ). I'm just reading some of the intro docs now, looks good (just perhaps badly-named).