Since writing this entry, I rolled a video giving a tour of the final assembly including the router wing, dust box, and custom power connection used to power the whole thing with 1 cable. This article is still what you want for assembly details, but the video gives you a better idea what it will do.
Over on the WoodTalkOnline forum, Brian Q and I were exchanging ideas for the SawStop. In my case, the router wing with dust box (I blogged in more detail here) and in his case his version of the SawStop Overarm Dust Collection. I believe he's making my dust box and I just finished his overarm guard.
SawStop sells an overarm guard, which is what started the discussion, but it's $200, which is a little steep for what it is. Brian's post on WTO describes how he did his and here I'll describe my version.
First, a view from the front then details of the build and special features.
Here are some additional closeups:
The hose at the top of the J to the blade guard was a lucky find at a pool supply store. The hose is 36" long with a 1.25" connector on one end that fit perfectly into the blade guard; the other end fits overtop the EMT conduit perfectly. I believe it was a Barracuda hose. Regardless, they have the right size hose and rubber connectors at a pool supply store.
Overall, I really like this system. I get better lighting, the dust hose doesn't get in the way of the cut (my previous hack...), far far better suction at the blade guard, no loose hoses behind the saw, and easily stowed to not impede certain routing operations.
Thanks to Brian for the initial ideas - especially the use of conduit and pool hose! - as it got me to fix a nuisance and gave me something simple to do in a too-hot shop. Thanks, too, to Andrew for asking questions about things not that clear in the text so I beefed up the photos.