I'm plannig a blackhawk diorama,too.
The Rangers will be modified Dragon figures with kneepads and ranger equipment (different from regular army).
The "Skinnies" are a problem. I got myself the african heads from Hornet ( www.hornetandwolf.com ) and wanted to put them on Verlindens, ICM and Warriors Taliban warriors (I bought all those kits). The problem is that the Taliban have tunics, that must be removed, and their clothing makes them appear way too fat for somali rebels.
So I hope someone comes out with african militia figures before I start converting the talibans.
BTW where did you get the technicals?