Another post from DeltaTwoForce says the mod is now working in multiplayer, too, so you can build your new PC with a friend.

I made a minecraft mod with which you can build computers that work as virtual machines, so they're basically real computers. You order the computer parts from space using a tablet.

Whatever it is you do (and really, I want to know), you can now add "play Doom" to the list, because with the help of a new mod, retro PC gaming has come to Minecraft.