The russian was in fact the one I had researched a few years ago.Just took me awhile to remember which one it was.We live in Kansas so the same weather here as MO..I have a really big round heavy plastic horse water trough liner that my kids used as a pool for years but now it has some cracks in the bottom and no longer holds water.I was thinking if I sank this into the ground partway it would make an awesome tortoise garden.
I can bring the tortie inside for winter.