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DIY electronics and Insurance
(reddthat.com)
For questions about component-level electronic circuits, tools and equipment.
1: Be nice.
2: Be on-topic (eg: Electronic, not electrical).
3: No commercial stuff, buying, selling or valuations.
4: Be safe.
It sounds awesome. First I would explain how difficult it is for low voltage to cause fires. If that doesn't work, maybe make a demo of a catastrophic failure (dead short) of your 5v brick, maybe he'll see that doesn't cause a fire. Or finally maybe encase the power brick and control circuitry in a metal container?