Updated to 1.12!
If you're able to accept your challenges in the future, instead of using building as an excuse not to take them, and then leaving and not even attempting to log into the build server.
This might be a weird question to ask, but if someone challenges me while I am on the build server, can I accept, let the person inside for the course, and continue building after I let the person in? Or would I have to stay online the PVP server? I know that we could read chat to see when they could be finished, so that's why I'm asking.
If you trust them in there alone then I don't see why not.
People are dumb