As per question.
There is no single working tutorial for 5.3.6 (either some features removed / changed / things changed) for Kimsufi.
I.e.
1 public IP needs to expose ports to 5 container's ssh.
Have vmbr0 with public IP (as any other kimsufi server)
vmbr1 with 10.0.0.1
container 10.0.0.2...