Wonder how he got the tread so thin without breaking. Also wonder how the armour would hold up against HEAT rounds.
Unlikely. If it took him a month then it would probably have taken a few weeks to construct it with a platoon or some large group. Nonetheless they would have had to find a way to keep it from melting and make it look realistic. He did really well but I don't think in WWII they had the time nor ability that he does have. Practically it seems unlikely and many higher officials would have asked: "Why don't we just use balloons then?" Or just have looked at the suggestie like he was crazy.
See the full set: http://englishrussia.com/2015/03/10/hundreds-of-tanks-made-of-snow-and-ice-in-russian-backyards/ There's a SU a few pages in that's the easy winner for me.