Simple question really. How big of a box do I need to cover my valves. Being a novice I'd like to get it right the first time. I've got the following... a 5 valve zone. a 3 valve zone with a 200 mesh filter (for the drip in the garden) a 3 valuve zone The web sites all give dimensions, but it's not clear to me how big a valve really is. I plan to use the rainbird manifold parts so things should be pretty neat and close together. Thanks in advance, Kevin.