DOOM is still a thing, right?! A couple of years ago I built a Miniland scale diorama of this classic videogame (there’s even a video that will take you right back to 1993). Below is a building guide for the game’s hero, commonly known as “DOOM Guy” (click here for embiggened version). This version is equipped with a basic shotgun. If you wanna kit him out with other hardware, or build him some enemies to blast, I’d suggest using photos of the original DOOM diorama as inspiration.
