First off, I'd like to thank everyone for your relocation ideas - very helpful! You've definitely given me a lot to think about. Feel free to keep adding suggestions!
I realized today that I haven't posted about Good Boy since his dramatic rescue, so let's get caught up, shall we?
One of the first things I did was take Good Boy to my own vet. Seeing as the rescue does not follow as stringent a vaccination schedule as my own vet does, I wanted to take him in for a get-acquainted visit and to see what the vet recommended as far as further vaccinations. I know that opinions vary widely on this topic, but it makes me feel better to err on the side of caution. Are cats over-vaccinated? Possibly. Do I still follow my vet's recommendations? Yes.
Long story short: Sorry, bud, you're getting the needle.
At home, I kept him in the foster room full time at first. Given his iffy past history with permacat Tinks, I knew I was going to have to take things slow as far as introducing him to the other cats. But I would be lying if I said I wasn't VERY happy to finally have a cat who would let me dress him up in ridiculous costumes:
Time to explore:
We did site-swapping ala Jackson Galaxy at first. I would only let Good Boy into a room when the permacats were elsewhere. That way he could get the lay of the land without having to deal with cat drama.
"Well, there's the birdfeeder, but where's the birds, lady?"
Blind date time. "Do you eat here often?"
I started introducing the cats at mealtimes, one at a time, at first placing the bowls on opposite sides of the kitchen, and gradually moving them closer and closer. I doubt they'll ever be eating the same strand of spaghetti like Lady and the Tramp, but they can peacefully eat side by side.
The only glitch so far is that Good Boy is so eager to hang out with the other cats, and he's so big and, well, clumsy, that he tends to galumph toward them at full speed, and they get scared and vamoose.
Long story short: It's going fine, if slowly. I'm so determined to do this right, as opposed to my usual modus operandi, which is slapdash and half-assed, that so far all is well. Nobody is overly stressed, there has been no major cat drama, and I'm hoping that soon, it'll be like Good Boy has been here all along.
What's one more, anyway? :)