Scale modeling – you can pick up a cheap kit at a big box craft store with some paint and glue for $40. Before you know it, you’re importing specialty kits from Japan, rigging up a spray booth in your basement for your airbrush, and taking trips to air museums to get reference photos of the zinc chromate primer for a cockpit interior.

Just a heads up, General Contractor is a term for someone who oversees contract construction projects, e.g., remodeling your kitchen. They’re licensed and insured (usually) professionals.