Becca, I've thought of the same things. It's amazing how many features I'm looking at in an A/S that have to do with pet happiness and pet practicalities. My DBF and I were looking at recent A/S models--in regards to a 25' Safari he said, "You know, this would be perfect for two people, a dog and one
cat." I blinked at him and said, "You know what else it would be perfect for? One
person, one dog, and three
cats." He got the point.
Personally, I think that pulling out carpet was a very good idea--you can get a little dustmop that will take care of 90% of your floor hair when you don't have carpet, and a little handheld vac could take care of everything else.
My dog is a Newfoundland mix and sheds more than all of the cats put together, so I'm all about the fur control. I can't say enough good things about the Pet Hair Magnet. It gets fur off upholstery, curtains, bathroom rugs, everything. It's not perfect--nothing is--but it does a great job and you aren't throwing away a million little tape sheets a day (save those for your clothes!).
If it doesn't take care of everything, I use the vacuum after, but it does pick up more hair than the vac will. Pet Hair Magnet
I know people who have used the Pet Hair Sponge and had good results, I've not tried it myself Pet Sponge Pet Hair Remover
You may want to pick up one of these to help with the brushing issue. Feline Fantasy Brush
For your curtains, I'd pull them down periodically (after de-furring them the best you can) and run them through the drier on the Air cycle a few times, cleaning the lint trap often. That seems to help quite a bit.
I look forward to swapping "multiple cats in Airstream" stories with you!