I bought a 53 foot refrigerated trailer that had been used as a construction site storage unit and office. It's already got a plywood floor and flourescent lighting, and a big window where the reefer unit used to be. I'm incorporating it into an expansion of my shop. We removed the wheels and axles and the landing gear and set it down on a concrete block foundation. With all the insulation that's in the walls I shoud be able to heat it with a BIC lighter and cool it with an ice cube! A regular sea-land container would probably need some foam insulation sprayed onto the inside walls to be able to maintain some temperature control if that's important.
