Not Ranked
When I was building my CMC, there was a 1/4" steel plate where the MC mounted. If i recall, it was floating, but there may have been some brackets. It did not just mount to the fiberglass firewall as yours seems to do.
I don't think you are being paranoid. I think this is a bit unsafe. If the MC were to start leaking around the seal, as they often do, it could soften the fiberglass.
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