Uberlord fixed the main issue I had in order to get gentoo/freebsd work in a jail: stop-start-daemon accessing /dev/mem and /dev/kmem
Now you can prepare your stage3, install openrc, dummify net and be happy in your nice jail =)
I must say that there are lots of issue here and ther in using FreeBSD with or w/out gentoo, but at least I’m getting a nice environment and got some issues fixed in the way.
ejabbed in Gentoo seems working almost fine while on FreeBSD there are weird issues that I couldn’t understand at all, still diversity is the root of evolution.