Finally decided to use diluted glue when applying the earth plaster formulas - the trouble was that for the very first layer applied on the wet (previously dried) plaster cloth, after the time needed to dry, most of it would simply come off - most likely as a result of the underlying plaster cloth robing the moisture from the small plaster particles in the earth formula. So in order to "help" the reaction of these small plaster particles with the mist airbrushed, I'm switching from simply water to white glue (1 part glue to 2 parts water). However thinking a bit further makes me realize that when vegetation get applied in the end, the underlying soil will be fixed anyway by the diluted Noch glue used specifically for the static fibers - guess my changed procedure will just help in those barren patches of land, left between vegetation.
Regarding the Noch glue used for the static grass, I've changed the ratio to 1:2 (Noch glue : water). This is done in order to reduce the visible change in color after the glue dries versus the initial color of the vegetation. (Kept reading a small note with the new ratio for some months now, so I decide it's finally time to write it here too).
The right corner that has seen much work last December now has some small rocks and dead, fallen trunks applied (using normal glue - white glue didn't work !). Since the first photo was taken, patches of various grass were set. As for the second photo, the lids can be clearly seen, still awaiting to dry. In the foreground, the Brawa platform is glued in place to the 4 mm supports (which took way to long to cut using hot wire). Also visible is the remaining infrared detector pair that had to be installed on the D segment, right before things were fixed with some plaster.