Doom's castle was was built onto and modified from its original form in our game. Several artists proposed ideas during preproduction, many of which I incorporated, along with my ideas. These included giant foundations, additional tech, and external catwalks.
Hallway variations located inside the castle walls. As the player goes deeper into the depths of the castle, the interior transitioned from castle to industrial tech.
The walls of the lab are lined with cyborg experiments and are powered by massive current being pumped through the walls. Giant screens allowed for the nemesis to pester the players.
The player needed to disengage bulky capacitors to overload the power. The connector arms needed to be clearly visible amidst the action, so the mechanism was exaggerated.