I purchased a Benchdog 40-120 router table extension wing for a contractors table saw. I'm planning to build a cabinet under it to provide support as well as dust collection, and, hopefully, some sound insulation. Is there an optimal size for the box that will enclose the router? Any guidelines about how much/where to let in air? Do I need to drill slots to allow air flow, or is the opening in the plate sufficient? Any suggesstions for sound insulation? I'll be running a 4" port to the box & 2.5" to the fence, connected to a 1.5 hp Delta dust collector. Any advice/suggestions, pics would be greatly appreciated.