Where,
The only thing that I would change on the panels is the connector, the MC-4 which is now the standard.
Have you seen any age degradation with your panels (lower peak power or lower peak daily energy)?
Whew - those Weigman fiberglass boxes are pricey! Take a look at this Carlon box from Home Depot at ~ $12
6 in. x 4 in. Junction Box-E987RR - The Home Depot
Steve