Home Built Chopper Ontario Home Made Trailer Question?

Home made trailer question? - home built chopper ontario

It gave me an open utility trailer with no rails. 5x10.
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I need an enclosed or covered trailer to transport a helicopter.
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A.) a person white, where to find the plans for the building to an enclosed trailer? I can only find an open trailer.
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B)) To DIY (Figure its only about $ 300 in materials up to $ 1,500 for a new trailer in comparison: What things should I have for building walls inside? (Drag / resistance, etc.) and how to do this? I think that will help the construction of walls, the edge of a semi-trailer nose bottle with the wind. Alternatively, it also is less expensive and is so similar to a military trailer, closed / open with ribs and a lid. I built the framework for the slopes before, but I know that the air resistance of the EFFDrag the TEC and the stability of the walls are connected.