Ok (here I go...). I think the turret part looks great; but since the model is just 4cm high, the tracks are rather smallish in my opinion.
I would prefer to see tracks that are slightly larger and go higher up the sides of the turret (like the French WW1 FT17 tank), with a plateau in between where the (removable) turret fits in. After all, the contraption in the thread that inspired you could be taken from its carriage to act as pillbox. A small steam engine & smokestack might be fitted to the back of the plateau in between the lenghtened tracks.
Rudi