I have an overarm DC hood (see pix)that I bought a couple of years ago, but never installed. Still in the box. $177 online shipping extra. Bought a Shark Guard instead. The PCI Table Saw Dust Collection guard is for sale. Anyone interested, PM me. Be happy at $75, +you pay shipping. Probably more a West Coast, MidWest thing.
That said, the Shark Guard really does a good job of deflecting the sawdust spit out the top. The first pix is the beauty shot, the second is the guard on my saw, with incra miter gauge in the background. A tiny bit of sawdust 2-5% or so leaks out the side, but nothing hits me in the face or decorates my clothes.
I was going to shop build what you guys are talking about, but when I looked at total cost, it made more sense to buy the solution. But for some kinds of cuts, you must remove the guard, and that's when the Grripper shines. Don't know about you all, but I've conditioned myself so I just cannot bring myself to get within 6 inches of any spinning bit or blade. There are always safer ways to do stuff.
The more I do, the less I accomplish.