Dave, so many questions!! Maybe that's why the yuppies haven't ventured over here!
DISCLAIMER! This is all personal opinion, not THE RULES!

Hinges: Look at the cars posted. The Red with Blue flames is the only one without. It's a lot of work, but does look nice. The guy doing the work or paying for it gets to choose.

Headlights: The Orange one with flames (notice it's the same car, different flames?) has smaller headlights mounted lower. He also took out the hood bulge, and replaced it with louvers.

Trunk lock: Electric is fine. The big 3 all had 'em. Just remember that if the battery is in the trunk, you want MANUAL! See other thoughts below.

Door handles: Shave them if you are doing the hinges. I prefer more stock, but as a body guy and the other choices you have made, it would match your build. Electric, same as the trunk, you want to be able to access without power.
Street Rodder has a few vendors that sell the solenoids and buttons.
Electric windows: Lil John Buttera did a cool deal, he had a remote that rolled down the window, allowing him to reach in to open the door. No outside buttons for the doors (theft resistant). Again, gotta figure out what happens when there is a battery problem. Also, it stinks in the rain.
Brake parts: Depends on if you want it up on the firewall (more lumps to smooth) or under the floor (where you need an access panel). Kits both ways, and junkyard stuff too. Best to get something that is easy to find and cheap. You don't want to use a 1971 only E body Hemi booster!
The major rod and Mopar brake guys can size a system for you. I went with 4 wheel disc, vacuum booster and M/C underfloor.

Hood latches/hardware: Stock will do or you can go crazy. Inside releases, Hinges that open all sorts of ways, etc. That can wait until you have gotten closer to paint.

Seats: There are a few Rod seat vendors. Most are big bucks. To save a few bucks and get it on the road sooner, try junkyard seats. The seat must be selected to make sure you fit and are comfortable, and you have good visibility. Then you mount the steering column! Don't forget being able to lay your arm on the door if that's required!
Steering columns: there are big buck billet columns or you can search for a stocker. If you have a few bucks, go for a tilt. After the early eighties, GM and Mopar used the same columns. Make sure you get the key! Also, if you want a floor shift, get a column without the shifter.
Wiring will depend on all the other components, but it makes sense to check with the wiring companies to see what they offer normally and what costs more. Ron Francis has a column in Street Rodder each month. Good Info.
Sound deadener: The name brand is dynamat. There are others all the way down to stuff you get at Home Depot.

Other thoughts: It seems like you are heading toward a modern 90s and newer style rod. Flashy paint, modern drivetrain and suspension, body mods, A/C P/S, PDB, P/W, P/L. Great choice and will fit in well with Goodguys and other big meets. You may not be welcomed with open arms at more traditional meets. That's okay too. If you plan on showing or selling, the guys that buy this type of rod will KNOW and look for name brands. If you have XYZ brand seats, wiring, interior, insulation, wheels/tires, and other stuff, it will be more accepted. It will also cost more. It might even be a little easier to assemble, since these are known quantities that other builders are experienced with. However, there are a TON of little things that will require thought, discussion, modification and maybe even tossing out and starting fresh. That's what makes it your rod.

I'd suggest trying to find a bunch of old street rodder magazines and any others you can find. Hit the swap meets or advertise locally (you don't want to ship!) and try to find the guy that's clearing out a bunch. It will give you a better idea which vendors have been around a while, how to do stuff, and how others have done things. You can look at a car you think is ugly, but there will be one little detail that makes you go HMMMM.
Or it will have 3 things you will make sure you don't do on yours.