My 12V panel does not have reverse polarity fuses, but that is an excellent suggestion.
The one downside to the way I did mine is it is almost impossible to reach the fuses on the new charger. If you put the heat sink to the rear they are accessible, but I was more concerned about heat dissipation than access since I have not blown a 12V fuse in the 16 years I have owned the trailer.
One of the other sites I go to regularly has a "Wikipedia" section for storing DYI run downs like this. That might be a good idea for this site as well.
