Thanks for the replies...
@-John, thanks for the nice words. The build up for the groundwork is very clear in the photo's above in this topic...but for you, I explain it more in detail.
First I made wooden frame with some balsa wood...put some isolation foam it in to fill up the hight and to make the elevation I needed to make the tank ditch.

Second, place some I-profiles in the base so later the corrugated sheets will slide in easy. I placed the corrugated sheets into the I-profiles so I can start with the groundwork...for this I used plaster mixed with dunesand en real earth and a bit of color (sand color)
One fine layer of plaster covers the hole spot perfect...in the still wet ground you can put some earth en fine dune sand, little rocks en pebbels. Once dry...several layers of paint come over it in different sand colors...so that's in a short story the buildup..if you have any questions...shoot!
@-Claude, I will do my best to achieve the same result like the 223...blending it in the groundwork shall be a great en fun work

Stay tuned folks!
Greetz Nico
