As some of you might have noticed I'm working on a diorama of a PZH2000NL in Afghanistan. I'm about 90% done with the gun. So I've started collecting intell on how to make a base for the gun.
The general idea is to put it in a dugin firing position. But I'm quite clueless on where to start and wich materials are best to use. I do have bought a couple of plates of styropur as I've noticed most of the modellers around here use that as their base for a dio. I do have a couple of photo's what I wish to have it look like:


So this is what I like to know:
1 Wich materials are best to use on the base
2 How do I apply these materials at best
3 How and with what paints/pigments etc etc do I need to color and wash the base
Ofcourse all suggestions to make things look even better are very welcome.
I do allready have some gravel and stucco patch in house.
Cheers Remi