If you are in a cold environment now you might want to paint the outside black to adsorb heat from the sun. If you are in a hot climate now you may want to paint it white to reflect heat. Also, thermal insulation and/or foam should help. You may want to have an opposite or other color paints in storage for after the pole shift in case you want to change the color. Air circulation system could be a key also. Holes due to rust can be patched with bond-o or fiberglass, etc. However, I wouldn't recommend this rust spot sit immersed in water for extended periods of time as it could soften the bond.
Offered by Mike.