Thanks!

Glad You like it.
Steel washer (podkładka). Superglue the figure.
Level the surface with not-so-freshly, thick (say 1 hour?) 2-part-epoxy up to the level of figures base.
Wait 24 hours.
Level the surface again, if needed.
Paint very thin layer of freshly mixed (up to 5 minutes) milky 2-part-epoxy-glue on the surface.
Wait 2 hours. Put into the box and delicately cover with mix of sands (animal sand+building sand).
Wait 24 hours.
Paint and wash - in case of desert bases: Valleyo Iraqi Sand and Sepia (Umber?) Wash.