It's probably that this has been commented before but... why Constructs haven't their own levels? I mean:
Undead: Candlestick Keep (and Graveyards)
Beast: Wolver Den
Slime: Lichenous Lair
Gremlin: Deconstruction Zone
Fiend: Devilish Drudgery
I know that there is a special level for Constructs in some missions like Assault on Machine Shop 13 or the second depth of the mission Toy Soldiers, but it still makes me feel that i'm in a normal clockwork tunnel instead some special level...
What about IMF?