BritinBritain
Per Ardua Ad Astra
Well, as the tracks and the drive-train has to come from somewhere, I suppose you'll find plenty ex-Soviet tank parts in that Tiger replica, and that would explain the weight.
I wouldn't mind betting that there is a crap load of old Soviet armour laying about somewhere.
My dad was in France after D Day. After VE day he mentioned there were untold French farmers fields filled with various German vehicles of all types, some scrap, much of it in good running order. He reckons someone somewhere made a lot of money out of those vehicles. I reckon he is right.