pool pump enclosure

We need to replace the old wooden pump enclosure. Looking for ideas for a maintenance free enclosure with hopefully some sound proofing qualities to cut the pump noise. Approx measurement would be : 7' long x 3' deep x 4' high. The existing structure is right up against the house so I need to keep the same footprint if possible. Also, we have a height issue with telephone boxes, electrical box so it can't be higher. Thanks for any thoughts, ideas. We can build or buy one that's prefab -
 
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