Unfortunately, I've already run into my first hurdle. I have a 10"
Delta miter saw, and I've measured the port as 1-1/2" ID.
Ideally, I'd like to run a short length of 1-1/2" hose (if I could
find it) from the saw up to the wall, then adapt to the 4" main duct.

The small ports are meant for shopvacs, not dust collectors. That
small of a hose will choke a dust collector down to the point where
doesn't work very well.

I was initially thinking a hybrid approach, a small hose connected to the
port on the saw, Wye'd in to a full size port near the back of the saw for
any dust that escaped.

However, now that I think about it, if I built a shroud of some type around
the back of the saw, I could probably just angle the little "Ell" port on
the saw towards the shroud. In theory, it should blow the dust back right
into the DC hose. Hmm... Something to look into.

Like I said, I just received the DC and am like a kid in a candy store
trying to figure out how to connect everything up. Most of my tools are
mobile, so I have to keep that in mind also.

I'll probably run my duct up in the corner near the ceiling, and thought I
would drill a hole in the overhead cabinets to pass the duct. Then I wised
up and realized I could just move the cabinet over a few inches and make a
filler to bridge the gap between cabinets. The duct would then drop down
between the cabinets. Good reason to examine my options before I start
cutting holes everywhere...

On a related note, my DC can be rewired for 240V if I wish. Since I plan to
install an outlet dedicated to the DC, what advantages would running off of
240V provide compared to running off 120V? Lower amperage, but wouldn't the
overall wattage be the same? I guess I don't understand the advantages.

Anthony