thats the PRODUCTION version. There are many details missing in prototype version as there is in production. Lets take for example the prototype version only shows 2 boxes on top of turret while production has 4 and additional supports under it. The back of the turret has fire extuingishers , ladders and 2 boxes while proto has 3 big boxes at the back not to mention lack of fire extuingshers etc...
Nah, these are minor differences, could be fixed in minutes.
Your model has some major geometry flaws - wrong turret shape, bad tube and engine compartment proportions, driver's hatch isn't in place (it should be one the left), gun's mask should be wider, sight on the right flank is too large. Overall, did you use some reference, or just your impression?
One more thing - could you please provide a photo that shows 4 boxes on the top of the turret? I wasn't able to find one among those PLZ05/04 pictures.