This is great feedback.
Not just containers, but it seems a lot of the machine sizes are out of whack with the size of a foundation (smelters, constructors, assemblers). The size conflicts make building on foundations more trouble then it's worth.
The foundation power idea is a brilliant solution. That would give the player incentive to put machines into a building.
Terrain manipulation feels like it's going to have to be a thing here for the game to come together properly.