Download v9os iso, burn the iso and install it onto your SPARC server. Use "solaris" for root password.
Download v9os repository, unpack and set pkg publisher:
mkdir /data; mv v9os_repository.tar /data
cd /data && tar xf v9os_repository.tar
pkg set-publisher -g file:///data/ips v9os
Use build-scripts from the https://github.com/alhazred/v9os-build to build v9os components.