This was a blue plastic drum that I got for free and painted beige. Cut a hole for overflow and a hole for a spigot. Only downside is that flow is somewhat slow. I may try to raise the barrel on blocks to get faster flow.
Interior view. The temporary support pole has been removed. Next phase is plants, heat sinks and a rain barrel. 3/4 inch crushed stone used for the floor and exterior drip line. Bottom center window opens.