Hi Jeremy,
I don't know much about modern armour but this looks like a Challenger to me, nice build.
Re the tracks, that's really a cost issue but I think they could have done with a bit more weathering as the rest of the vehicle looks cool.
As you're showing a vehicle with crew, some more kit around the tank would have been good and given more interest and contrast in colour.
That said, great build and what do I know anyway, that's just my preference.
Cheers and thanks for posting this, it's a mighty machine.
Al