Concrete Pillbox

4x4m squat hexagonal reinforced-concrete pillbox roughly 2m tall with a stepped embrasure slot on each seaward face, a shielded rear entry and a flat overhanging roof lip, with a size knob from a small infantry box to a heavy casemate.

风格：low-poly, flat-shaded vertex colors, no textures, single shared material, so any set of these merges to one draw call; shares palette and scale with its kit