Has anyone built their own camper?

Basically build from the inside out instead of a S&B where you build outside in. I built a small set in camper. I bought some building plans at an RV dealer. Once inside is finished add aluminum paneling to the outside then put in the windows. You won't save any money as previous post said. You will have fun and of course need more tools. Small router for countertops etc. You can control quality control. I over built and mine was way to heavy.