Since this was posted, I have purchased and installed two Harbor Freight 2hp dust collection units, one in each shop area, and both have chip collectors as well. The shop unit has a Wynn 1 micron folded filter, the one in the garage still has a bag, but will eventually get a Wynn drum filter as well.
Despite all my home-made efforts, the HF units out perform everything I've tried, and on sale with a coupon, they cost less than I've spent trying to save money. There are other strings on this topic with more detail. I wish I'd gone with the HF units in the first place.
The more I do, the less I accomplish.