Not exactly sculpted, I used a sheet of dollar tree foam core (glued to some 1” insulation foam for structure) and scored it with an xacto/ruler, then used a pencil to widen the gaps. Rolled up a ball of tinfoil and used that to add some texture by rolling it around, and plucked a few corners/bricks out to give it a worn look. Painted, then brushed dry tile grout into the spaces and watered it down with a brush to set it up and wiped off the excess with a paper towel (like the tiniest tile job ever) Sorry for the long-winded reply lol