[bluebrooks]

For the most part, if you saw something in a single-player mission, it can be recreated in a multiplayer map.
Sometimes this gets very tricky with a server-side mod, because you have to create your own scripts (can't copy them from the stock single player map scripts).
So, to answer your question Lyme, there is a lot more you can do to the objects besides making them bulletproof. You can prtty much do anything you want.