Once I printed the Scull bowl I wanted to mount the bowl and create a cup.
Then i found the spine and made them match with some interference in meshmixer. Added a base and couldn't be happier with the results!
The skull bowl and "spinebase" fits where the spine meets the skull and needs to be glued in place with the adhesive of your choice. Mine printed with PETG so CA glue worked great.
Added both the "spinebase" as a solid and as two solids in case you want to mess around or replace the base.
V1.1: Added one with support for the base when you print it on its back.