Great Sketch ! This "Capsule Car" concept for solo travelers is fantastic! You've clearly thought about essential features, like the solar panels for sustainable power and the multifunctional interior, which aligns well with the needs of travelers who want to live and move efficiently. Here are some suggestions to help further develop your design:

• Design the car to have sections that can expand when parked, like fold-out solar panels, slide-out storage compartments, or a pop-up living space. This modular aspect would make it look highly advanced and multipurpose.

• Besides the solar panels, think about sustainable materials that could be used for the structure, like lightweight aluminum or recycled composites. You could even consider integrating rainwater collection on the roof, which could be useful for shower or cooking water during long trips.

• Instead of flat solar panels sticking out from the roof, you could experiment with a curved roof where the panels are embedded. This would keep the car’s profile sleek and maintain the streamlined look, while still allowing for maximum solar exposure.

• For testing these shapes, try creating models with clay or foam to visualize how the curves and angles affect both the aesthetic and functional aspects.

• Use smart glass for the windows that can tint automatically for privacy or adjust lighting levels based on the time of day.

• Install small, retractable cameras around the car that can provide a 360-degree view, helpful for both parking and navigating tough terrains.

• Consider adding LED lights along the seams or edges, which could illuminate at night to create a "glow" effect, adding to the futuristic vibe.