not much progress this time, but still keeping the update coming.
i had some pvc-hardfoam plates left, so i used them to make a wall looking...wall :)
i created the gaps with a typical screwdriver, but anything not so sharp would do the trick.
after that, i coated the plate with a layer of acrylic paint, to fill the gaps with a base color.
the plates got painted fully, with spots of darker stones and spots of lighter stones...not that hard to do, just try to get a nice look.
in the end, the plates were attached to the case.
right now i am trying to get my fan grills done, which i failed 2 times this week because they did not fit my purpose.