This air compressor was designed after the classic Ingersoll Rand trailered unit, and includes a removable roof to allow for further detailing, as well as a hitch that is adjustable. The hitch height is determined, then glued in place, the base removed once glue is dry.The wheels are also separate to allow for easy painting, and the entire piece is surrounded b a protective cage to help avoid damage in shipping. I have left the outer covering plates off, as they can be easily replicated with thin styrene or brass. It has passed the software checks for the detail materials, but should there be a problem, contact me via the designer link, or via email to modelmechanic@gmail.com