I'd agree maybe some pics of your bare walls so we can see what type of construction you're dealing with being that we're customed to metal school busses.
I where this is going to go is, you're going to need to mount your own nailers, aka something to be able to anchor to. So if we can find something strong enough in these fibreglass walls, to where you run something like a 1x4 or 1x6 the length of the bus front to back at maybe 2 different levels, then you'll have something to anchor too that will hold cabinents and sofas firmly in place. Maybe something like a foot off the floor and 2 feet off the floor. To mount those nailers, you might need to use some kind of backing or added supports to make them strong. Once you have those rock solid the length of the bus, then you'll have something you can anchor everything to with either wood screws or lag bolts, or some other strong fastners. Surely there's a way to work this out, but send pics for better advice.
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