Some progress. I made some large black radiation symbols/motion tracker decals for the sides and body. I also added a third liquidator, who I'll call Vadims. I replaced the shovel head he was carrying with a wide squeegee and a longer pole. The concrete base is made from a dense, solid white polystyrene foam sheet. I carved the squares, chipped it and made a drain grate:
Story suggested using a UV glow powder for some glowing radiation effects. The images below show the UV glow powder (in a container) under the grate. The first one depicts the faint Cherenkov radiation glow inside the drain after giving the powder a brief shot of UV:
Same, with the lights turned off (only indirect sunlight):
Lights off, but with the UV LED shining right at the powder (from the side):
I may add some powder "washing off" into the drain, but I have to test how it works when mixed with a clear medium like Future.
I'll also add some equipment, possibly a spot lamp and some debris, but before that I'll paint the three figures and start weathering the ball tank.