I’m ready to transform my concept of a brushed-matte stainless-steel train case with dark-brown leather accents into production-ready reality. The priority is nailing the overall structure and materials—every panel, hinge, and seam must feel rock-solid yet refined, while the textured leather corners and matching handle give it that vintage-meets-modern character I’m after. Here’s where you come in: I need the full design development journey, from polished 3D CAD layouts through to precise technical drawings, but the key deliverable I want to see from you is a set of physical material samples that prove your finishes, leather grain, and interior lining will look and age exactly as intended. Locks are flush, three-digit combination units in matte black, and hardware throughout follows the same subdued tone. If you already collaborate with manufacturers—or can introduce me to one capable of a short run of roughly 100 cases—let’s leverage that network for swift prototyping. Otherwise, guidance on sourcing will be invaluable. Send over examples of any luggage, leather, or metal projects you’ve shepherded from sketch to sample, outline the design timeline you foresee, and break down your pricing structure. I work comfortably with SolidWorks, Rhino, KeyShot, or comparable toolchains, so feel free to reference whichever platform you prefer. I’m looking forward to seeing how you’d translate this vision into samples I can hold in my hand, approve, and push straight into production.