Nice! It's very similar to one I built (including the exact charge controller,) at a fraction of the cost of a commercial product. If I had to do it over again, I'd use the 50A connectors like you did rather than 45A Anderson Powerpoles, simply because it's easy to bolt the 50A connectors to the box.
BTW, I discovered that if I (seemingly) fully charged the battery via the solar charge controller, then hooked it up to my sophisticated AC-powered charger, it would dump several amps into the battery for quite a while. That means that the cheap charge controller stops the bulk/absorb stage too soon (on mine it was at 14.1V,) and it didn't continue to charge appreciably in float. In use, it doesn't matter much because I rarely need more battery capacity, but I do hook it up to the fancy charger occasionally and run an equalizing charge. Seven years later, the battery is still going strong.