Nice job Chris. I made a similar one for my Dad's old contractor's saw a while back and it did a pretty good job. Mine was just flat bottomed.. I think yours going into a V would do a better job. I never made a ZC insert for it, but I don't think it makes much difference with, or without, a ZC insert as far as dust collection goes. A lot of the sawdust collects in the gullet of the blade and is swept underneath as the blade revolves.
I now have a Rigid(R4511) hybrid saw with an enclosed cabinet, similar to Dave's, and have made a ZC for it. With the stock insert, or the ZC that I made, it doesn't seem to make a lot of difference in the sawdust in the air.
I've seen several different designs for over-the-table dust collection, but never tried any. A simple hood suspended over the blade seems to be the most common theme. I just resigned myself to the fact that it is impossible to catch ALL the sawdust and just wear a good dust mask.
Sometimes I wonder whether the world is being run by smart people who are putting us on
or by imbeciles who really mean it.