Mud Aggregate and Open Storage
I’m going to leave these up for now, but once Cosmonaut mode is officially released I’d recommend using the vanilla free storage buildings.
Small mud versions of open and aggregate storage for your cosmonaut games. Both only require manpower to build. Each holds 10 tons. Useful to get started, but not enough to support much more (unless you want to build 20 of them-do whatever you want).