Zebrano from Belarus announced a Tsar Tank in 1/72 towards the end of 2018. Passed me by: I only discovered it yesterday. It's priced at €100+, though. Their first venture into WW1. Apparently they're only making 40 kits. Possibly all sold now.
Their other products seem a bit variable, apparently. I don't have any of their plastic but their resin products and figures in 1/35 are nice. The wheels here are etched brass, 2 one-piece discs per wheel with plastic tread segments. All supported on a thick aluminium axle.