So, it was ALMOST legal and ALMOST permitted. This is a medium sized completely gaseous propane thumper style flame unit. All I need is a regulator to be in "spec" - but since all the components are rated almost double what the highest unassisted pressure the tank will deliver, I feel that I can get away without a regulator for now.

Very simple, very safe. No electronics, MAPP gas pilot light. Slow recharge.