I've finished the working on the major parts of the turret & hollowed it out. I hate making complex curved parts like this & I'm not 100% happy with how it turned out, After I've printed the parts I'll probably add a bit of putty around the machine gun ports & main gun mount & sculpt it a bit to smooth out the transitions into the main turret surface. I also made the main gun, I though about making the barrel movable but I'm feeling lazy so the barrel/mantle will just slot into a hole in the front of the turret. For the cupola the diagram shows the layout of the view ports but not the hatch mechanism, I decided to make something similar to the Panther tank's cupola hatch as the view port layout reminding me of the Panther
I still need to add a hatch on the rear of the turret, a view port for the driver & the fenders to the front & rear. After that the largest part left is engine deck, which is blank in the diagram
so I'll have to take my best guess to fill it in.
PS: Finally added some proper lighting & shadows to the model