What about the cover?
Make one out of metal and move on.
II. Construction Specifications
312.10 Material.
Cabinets, cutout boxes, and meter socket enclosures shall comply with 312.10(A) through (C).
(A) Metal Cabinets and Cutout Boxes. Metal enclosures within the scope of this article shall be protected both inside and outside against corrosion.
FPN:For information on protection against corrosion, see 300.6.
(B) Strength. The design and construction of enclosures within the scope of this article shall be such as to secure ample strength and rigidity. If constructed of sheet steel, the metal thickness shall not be less than 1.35 mm (0.053 in.) uncoated.
