Create a photorealistic design of a vintage-style burger business where hamburgers are prepared in a classic Volkswagen Combi van. The van should be styled with retro elements and vibrant neon lights illuminating the scene. The surrounding area should reflect a nostalgic, old-school atmosphere, with vintage signage, cozy seating, and a welcoming ambiance. The neon lights should highlight the Combi van and the overall retro theme, creating a lively and inviting vibe for the burger business.