Yes, I'm in Bosnia. Winters here come around November and lasts till March-ish... It depends, sometimes winters are rough and cold with lots of snow, and sometimes mild and more rainy than snowy. I'm a planer as a person, so planing for Korni's outside tank is never early if you ask me. Bigger problem is finding turtle equipment and necessary stuff. You can't get anything for serious turtle owners. Those plastic bowls with built in docks and stuff, it's painful really haha.. In most zoo stores you can't even find any food except shrimps. I went to our local store in Bihac, and asked for pellets, he looked at me like I'm an idiot and was TURTLES EAT SHRIMPS, YOU BUY SKHRIMPS. and I said MISTER, YOU SHOULD CLOSE YOUR SHOP, OR AT LEAST GIVE IT TO SOMEONE WHO KNOWS WHAT THEY'R DOING OR AT LEAST CARES. So I found online shop from Sarajevo, and I order stuff from there, but there is also a little to be found for turtles. That's really ironic because there are a lot of people who have turtles as a pets.
I believe I'll have to build it somehow, I don't think it's gonna be that easy.Now, I first got to get a new bigger inside aquarium, I have a small one now, I believe it can buy me a couple of months I hope with Korni. I would like to build him something similar to yours, cause it's just simple but cozy and beautiful. Really stylish