Defense bases for Warmachine

Set of bases for defenses for the game Warmachine. Includes 3 each of:

Explosive barrel (20mm circle)
Fire Pit (50mm circle)
Barrier (4 inch by 0.5 inch rectangle)
Spike Trap (2 inch square)

(yes, the game defines them in a mix of imperial and metric units... it's weird).
These are meant to serve as placeholders to get started until you can buy or build a set of your own. They could also be used as bases to construct a kitbash or custom sculpt on top of.