Nice start! There are a few problems nonetheless...
- almost all pins are missing
- some parts are slightly misplaced. I see that you used LeoCAD, you should set your grid to half stud in all directions. Have a look at this documentation.
- the model is upside down!
- The tread tracks are not the right ones (but the right ones are not yet official)
- A few colors are wrong
Here attached your model with the last three problems corrected.
