@carlsbad2
Jerry , Your crossover is beautiful and your intent on mounting it externally should provide and extra level of improvement that I can't figure out why we aren't seeing speaker manufacturers doing it .
I wish that the crossovers in my speakers were as simply designed as yours , the woofer board alone have more components than your entire crossover board . I am just one capacitor away on the mid range from finishing my crossover upgrades. It's been a lot of work that few can or are willing to undertake but I'll say it been well worth the expense and effort with more than a 2% increase in sound quality , after all each of our components are built to meet a price point .
Rob