Our ‘56 Safari
has a toilet, small corner sink (like this one
) and a wall mounted shower faucet extending up from the sink faucet. We added the tank under the toilet during our restoration because it didn’t have one. I believe the ‘55 Safari is similar, but instead of the small wall-hung fiberglass corner sink it had a cabinet mounted sink across the front. So I don’t think it would have had the wet-bath because the wood cabinet would get wet. Here is a link to the ‘55 Safari brochure
from the Airstream website that might help. You may also want to check out the vintage Airstream photo archives
especially this bathroom sink photo
. If you’re retrofitting a compost toilet in there, you can do whatever works best. I will say, our bathroom is rather small (we call it “the birdbath) not sure of the size of your composting toilet, but the ones I’ve seen are bigger than our standard Sealand one is - you may need to make your bathroom larger than the original one.