Mojo, We do similar EQ mounting panels (those that liljohn referenced are very nice) and we do custom one-off units to fit vaious electronic combinations. When you state 'eq housings' it makes me think that you are describing something a little different like an enclosure or protective shroud. Give me a more specific description. Custom isn't a problem as long as you know what you want.
You can shoot me an email if you like: firstname.lastname@example.org
It may be Monday before I can respond.