パーツを付け替えられるガンダム風メカのThree.jsコンフィギュレーター

Build an interactive 3D mecha configurator as a single web page using Three.js. Show a blocky, hard-surface robot in white with blue and red accents, standing on a pale warm-beige floor with a soft shadow. Add a clean light side panel with a roster of three mech units, dropdowns for head crest, weapon and back pack, a presentation section with turntable, hard outlines and ground shadow toggles, and front, three-quarter, side and back camera buttons. Changing a dropdown should instantly swap the matching part on the model, such as a beam rifle or a heavy cannon. Support drag to orbit and scroll to zoom. Include a small readout with part and colour counts. Done means switching units and parts works smoothly and the mech reads clearly from every angle.