This is a great project.
I've been testing it for some time now and it seems to work without any problems.
Even Docker runs without problems in an LXC. Besides a few other services, I run a SPS node which has been running for 77 days.

I use Wiregard, which also runs in an LXC on the same computer, so that I can control and interrupt the communication between the respective containers.
I hope you enjoy your new achievement ;)