What to do with off brand dollar tree monster truck castings ? Customize them of course. Armor and “bits” are mostly scraps of styrene, the drill/ram crafted out of a disposable pen cap , skull good ornament is sculpted from miliput epoxy weathering is a blend of cheap hobby lobby craft acrylics and “rust” on the wheel rims is rust from steel wool mixed into some other cheap acrylic paints.
