I keep putting off running my shop vac duct as I know I can come up with a better plan. Meanwhile all the parts are in my way and I have to keep swinging the hose back and forth. Not a big deal but I know myself and if I put this off till "genius" strikes, it'll be next year if I am not careful.
Put a wye at the vac. The Rockler wyes wouldn't quite accept the standard vac fitting. I have adapters that I have picked up here and there but this was so close a few swipes on the spindle sander yielded a good friction fit:
A gate at the DP:
and a gate at the smaller BS:
This is one of those $20 Black Friday vacs that I got at the BORG last Christmas. I picked up the gates, Wyes and so forth during a Rockler "red dot" sale and got out of there for about $20. The clear Woodcraft hose was on sale for $15 and free shipping. the DP and the BS are hooked to a box that turns the vac on when either of them are powered up.
I just try to keep a picture in my head of where I want the shop to be headed. When a sale comes by on something that fits that picture I can take advantage of it. At least now I can use the gates while I ponder a design of perfection. Translated that means it will be like this for a long, long time ;-)