Move in 3 dimensions.
Can place multiple blocks. Aren't sent to server though.
Cleaned up a little bit of code.
Placed blocks now broadcasted to all connected clients.
Store array of blocks on server, and send to client on connect.
Display other connected users's cursors.

It all actually works! I'm surprised how easy it is. Pretty impressed for just 2 days of messing around.

That's it. Our project's all done now.