If I were to design a bracket to hold a compressor I would look into making a box with the rear open to provide plenty of splash and hopefully some heat protection as well. Perhaps overkill. The downside to this design is that you are limited to compressors that fit within the box.
At home I have a large 12v boss compressor which is about the size of a battery and an arb compressor which of course is much smallet. Unfortunately when building an enclosed unit you limit your choices for what you can put inside it.
