Dust Collector Design

I haven't been here lately for a number of reasons, most recently I've been going through the hassles of selling my home in TN and buying a new one in Alabama.. The things we do just to be near our grand kids. I am getting a big benefit from the move which has me pretty excited. I will have a large basement located on grade level with one end open to the outside through sliding glass doors. Easy access and a lot of outside light.

But to get to my point, I want to install a dust collector system. This is all very new to me and I'm not sure what I'm planning will work properly. I read the previous posts on this on Routerforums as well as watched a number of videos on YT. See my sketch below. I believe it's fairly typical for the most part. My plan is to use a Harbor-Freight DC along with a Dust Deputy. I also plan on upgrading the DC with a Wynn filter. One of my concerns is the use of 2-1/2" flex hose.

1) Will the 2-1/2" hose be adequate for its intended purpose? The ports on the equipment are 2-1/2" thus the use of 2-1/2" hose.

2) Does anyone else run 2-1/2" hose to their equipment?

3) Would I be better off using 4" flex hose and then reducing down to 2-1/2" at the equipment. Would it make much difference?

4) Any suggestions on what to use to ensure a good seal on the connection of the trash can lid to the trash can?

I'm only showing 4 equipment hook-ups, but will probably add more; one for my miter saw and another for the Rigid oscillating sander.

Any comments, either design or installation, will be greatly appreciated.