Sure, let’s cut the fluff. First, pick a real material—carbon‑fiber composite, not cardboard. Then lay out a structural model: a truss lattice for the frame, load‑bearing joints, and a pressure hull that can survive launch stresses. Next, choose a propulsion system—chemical rockets for launch, but for space use a small ion or nuclear thruster. Add redundancy for all systems: power, life support, avionics. Finally, build a scale model, test it in a vacuum chamber, and iterate the design until the stress calculations are clean. That’s the roadmap from cardboard dream to functional craft.