If anybody's interested, there's a working version done.
PC VersionMac VersionThe menus are still crap, but now servers work, so there's that. You can create a server with campaign data and have others connect over the internet.
The Manual and StuffCreating a CampaignTry using the 'Campaign Creation' menu. After you name your campaign, you can access it with the 'Load Campaign' menu. In the campaign editing menu, you can create new scenes and new characters. When you create a character, make sure both text fields are the same (characters are just boxes, and can be added by using CharacterBase). After you've made a character and a scene, you can add objects to your scene by clicking on the button labeled with the scene's name and pressing Alt to open up the DM interface. This also allows you to use the mouse for other things than controlling the camera.
Building ScenesOn the right side of the screen (after pressing Alt), you can find a button that let's you add stuff to the scene. Currently, you can add characters (which must be predefined in the Campaign Editing menu) or you can add scene objects (currently you can type in 'Wall' or 'Floor'). After adding an object, you can select and deselect it with the Space Bar. When selected, the WASD keys will allow you to reposition the scenery. Characters cannot be selected unless you turn off Scene Building mode.
Obviously, the Save Scene Layout button saves all objects (including characters) and their positions. The 'Push Scenery' button sends the scene data to any players connected to a server you are running.
Running a ServerIn the Campaign Editing menu, you can select the 'Launch Server' button to start a server. Don't use a password, though, as I haven't gotten around to implementing that particular feature. Players can connect through the Main Menu, where it says 'Connect to Server'. After a player is connected, he or she may click 'Join Game' to allow the DM to open a scene and send it to the players (scene data is automatically sent upon loading, but may be resent with the Push Scenery button). I actually don't know what will happen if a player joins the game after the DM has loaded a scene, but I guess we'll find out.
Once the players are connected and the scene is loaded, the DM can allow the players to control a PC by aiming the cursor at a PC and pressing the Space Bar while OUT of Scene Building mode. Once selected, the players can control the character with IJKL (like WASD) or an XBox controller. Similarly, the players' camera can be rotated with the arrow keys or an XBox controller.
Also, I have absolutely no idea whether or not it'll work on a Mac. Sorry about that. On the plus side, networking! Yay.
Oh, and before I forget: the media editing menu does very little. It can load .pngs, but it can't send them to players yet. The idea is that eventually you'll be able to show images and play videos on the players' computers, but that will take some time to implement.