I will be building a new house and shop this fall. So far all of my time has been in designing the new house and building cabinets for that house. I currently have a 30 X 56 shop, but the new one will be 30 X 40 with a 10 foot lean to on one end. For dust collection I have the following: Jet 1900 4 bagger, Jet 1100 2 bagger which I bought the Jet Vortex attchment, Jet overhead Air filtration, 3 shop vacs, one converted with HEPA and dust deputy, two vacs with dry wall bags and upgraded filter, delta downdraft table, 1 Thien 30 gallon trash can separator and a 55 gallon drum to make a second or add a cyclone. Main tools for the dust collection are the Jet cabinet saw, MM FS35 jointer/planer, Dewalt 735 planer, Supermax 19-38 sander, PM 90 lathe. Here is my current thinking on the set up. Every thing is on wheels except the cabinet saw.

Dust collectors I intend to put the Jet 1900 outside under the lean to using the bags as installed but add the 55 gallon drum and the $199 6" cyclone on ebay. I intend to have only one run about 10' and then reduce it to two 4" (15' of flex hose)for tool hook up and move the major machines to an area. The second 4" would be used for drill press, band saw, and miter saw. I do this now and with a smaller shop I don't believe there will be enough room to have every machine in a stationary place with a run.
(1) I don't think you can make a Thein with 6" ports for the 55 gallon drum can you? (cheaper)
(2) The Jet 1900 has 3 four inch ports, do you just make a cover from plywood with a 6" port?
The DC 1100 I will add a Wynn nano filter for use on the inside with the 30 gallon Thien. This would be mainly dedicated to the cabinet saw, but would use in the extreme cold so I don't exhaust all my heat.
(3) I think a Dylos would be beneficial yes/no?
(4) If so is it worth getting the 0.5 micron over the 1.0 micron? Or if you have increased 1.0 levels you will have increased 0.5 levels. For wood working I think it would be rare to have just 0.5 levels increased without 1.0 levels increased.

I haven't bought anything yet or even laid out the shop other than I want 12 foot ceilings, 16 X9 overhead door, service door and four 30" windows and hot water floor heat.

Open to suggestions and changes.

Bill