Its really good idea. I don't have my server up and running any more. I used to have it for a while. The funny part was one of my student formated my root Filesystem. Thats funny and server was down. So its sort of tough to give root password to users remotely since there is a chance to go out to other servers on the networks. Thats my personal experience. Mostly once you are internal there is very much chance you can explore other servers as well.

Having said that I am ready to teach online if someone creates a group. Lets have some platform and make it possible. Its been so long haven't worked on Linux but the core with Linux and Unix is pretty much same. I can prepare Intro Unix training material if someone is interested.

Cheers !!!!!!!!!