Congratulation for hard work!I'm install GuixSD 0.8.3 in other laptop with success, no error reported in momment. I did upgrade my old version, my current laptop, and it's ok.
I installed Enlightenment desktop in GuixSD with success (I wrote a post about it[1]).
Any bug or question I'll report it. Thanks, 1 - https://d4n1.org/guix-enlightenment/ -- Daniel Pimentel (d4n1 3:)