64-bit childhurds are in the house!
https://guix.gnu.org/manual/devel/en/html_node/Virtualization-Services.html#index-hurd_002dvm_002dconfiguration
Means anyone on #Guix can run an x86_64 #Hurd virtual machine just by setting (type 'hurd64-qcow2).
Kudos to Yelninei for this work!