Those first three photos look good, just like the buildings in the ghost town of Rhyolite on the edge of Death Valley. I use two part epoxy to repair broken hydrocal, and then fill cracks with model putty and sand. But that looks like you are missing parts to reglue, so, I'd fabricate them, since I'm too impatient to want to hassle getting replacements, but you can try for that from the mfr. That "tile" wall, I'd just epoxy.
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