Do not use this Fuchs. It`s the Spürpanzer Fuchs (NBCRV) that has never been deployed to Afghanistan. I would rather go with Revells Dingo 2 for a roadblock.

Roadblocks in Afghanistan were only temporary, so the use of heavy barriers would be doubtful.
Here you can find a typical layout:
http://hx3.de/community-161/aufbau-checkpoints-camps-19836/

One remark abozt the berets. I think you should repaint the berets in medium green or dark green color. Panzergrenadiers that go with the Marder have the green color with an oak leaf crest. Bright red or Korallenrot is the color of many support units like Artillery, Feldjäger, Engineeers and Supply. Otherwise good job on converting the figures.
One more remark. Remove the Rotaing Amber Warning Light from the Marder. The RAWL is only used in Germany for traffic safety.

The camo on the figures look great. Their eyes are a bit googly though. Eyes are usually the hardest part to paint on a face. I use a cross design to paint them. First paint the white area with a small white, horizontal line on each eye. Next, paint a small vertical line in the color you want the eye to be. You will now have a cross pattern on each eye. With a very small brush, now use some flesh color and make the shape of the eyes as long slits, not circles. If you look at people outside, you will see they appear to be squinting as their eyes appear as slits, not big circles. Thi is a pretty effective method.

Some examples:





Good luck and keep up the good work.