re: Building a new workshop

My shop is 10×20, so I have quite a bit of experience working in tiny spaces. I second the motion about putting the dust collector in a separate space. If you are cunning about it you can make it look like a free standing outdoor cabinet. Insulate it, weather strip the doors, and make sure you put in some sort of return air duct so you aren’t pumping your shop heat outside and making your shop cold. Put your air compressor in that space too.
If you can get away with it, build taller. That will allow you to have plenty of overhead lumber storage. All of my clamps, and many of my hand tools hang from the rafters in my shop to save space.
Everything is on retractable wheels so you can move it around as nesessary. Make your workbench the correct height to easily serve as a table saw out feed table too. Make a Masonite cover for your table saw with lips around it to hold it steadily in place. This let’s you retract the blade and use your table saw as a finishing or assembly table without worrying about spills.
Try to make everything in the shop easily movable, and multipurpose.
Finally, I second the motion about lots of lights. Forget florescent. LED bulbs are now cheap enough that you can install lots of old fashioned light sockets in the ceilings and light with LED for less. Put a few outlets in your switched light circuit to plug in things that shouldn’tbe left on, like radios and battery chargers, so when you shut off your shop lights, they go off too.
That’s about all I can think of at the moment