tactical boot 3d model

Create a CAD-ready 3D model of an INTERNAL BOOT CAVITY (negative volume only) for a high tactical boot, EU45 (300mm length, 105mm width). NOT A BOOT. Only the internal empty space. Model must represent full internal volume of a tall tactical boot (Zephyr/Grom ZX07 style): toe box, midfoot, heel, ankle and shaft up to 200mm height. Single watertight manifold solid. Requirements: realistic EU foot + ankle shape, uniform ~2mm clearance, smooth transitions, no sharp edges or artifacts. STRICT: no external boot features, no sole, laces, stitching, textures, or decoration. CAD: clean manifold mesh, no holes or self-intersections, scalable, offset-safe, ready for 3-part split (toe/midfoot/heel-shaft) and PLA 3D printing.