Welcome to CSC! You'll find a wealth of info on this site. I have a 72 Seafari I've had since 1975; it's a very versatile boat that can comfortably do more different things than any other model. If you'll send me a PM with your e-mail address, I can send you a 72 brochure. Both the Seafari and the galley seat are Carl Moesly designs, so check out this web site for more info and a brochure on the '69 model:
moeslyseacraft.com
As for the galley seat, check out this post I recently made:
classicseacraft.com/forum
You could either make one from scratch with a sink sized to fit a modern stove, as I was thinking about doing, or find another member that has one he doesn't want. Is it worth doing? Depends on what you use the boat for, but I think it'll be real handy if you spend many nights on the boat. Will be able to give you a better answer after the Long Point Gathering!
As for the bulkhead, it originally had woodgrain contact paper on it which fades pretty bad. I'm thinking about covering mine with the same Formica I used on the galley seat.
For the adjusters on the cabin hatch, I used these:
BOW
They're pretty slick as they don't have any knobs sticking out to get in the way. All SS and I think probably cheaper than most of the stuff from Perko. Original cabin door had a Perko lock/latch set that's still available. The lock didn't work too well so I added a simple drawer lock to mine. The windshield adjuster knobs are simply threaded for 10-24 screws, so there should be a lot of knobs that would work; maybe check a good hardware store or the Beckson web site.