Following the current version of the ZFS Install Guide - Funtoo the system fails at boot. The two primary issues are:

• Cannot import 'rpool' : No such pool or data set
• Determining root device: cannot open 'rpool/ROOT/funtoo' dataset does not exist

 See forum thread:  https://forums.funtoo.org/topic/1501-zfs-installboot-fails-no-such-pool-andor-could-not-find-the-root-block-device/#comment-7422