from the containers config file and the line
from the containers fstab file, X over SSH works. From what I read, these two lines give the container a private pts filesystem. Not sure why this helps, but hopefully it will save someone else hours of frustration.
devpts /container/elevenbc1/dev/pts devpts defaults 0 0
devpts dev/pts devpts newinstance,ptmxmode=0666 0 0