Quick and dirty barbed wire obstacles

Here is the result of a quick and easy terrain project.  Given a chance, soldiers will enhance their defensive positions any way they can, and installing barbed wire is a fast and easy way to slow an attacker.  These four little emplacements are each 2" x 6", and can be easily dropped onto the game table.  The base is cork board, which unfortunately warped a bit when painted, along with toothpicks for posts and what I believe is called 'sealing wire' by industry users, except that I paid far more than its worth because it was repackaged as 'battlefield razorwire' for 28mm gaming. 

I'll take another go at these over the weekend to see if I can reduce the warping.