Rex, can't wait to see what you do next on your MBT-70! It's one of my favourite Cold War tanks along with the M60 and Leopard 1.
I've made more progress on the turret. Since the last update, the upper and lower armor plates have been built and installed. I made sure that the lower side plates curve up at the right angle:
Next, I inserted the inner bracing that supports the outer skin, these will also help to determine the curvature of the side armor:
Here's a peak at the space inside the turret for the gun mechanisms. As mentioned previously, the entire gun assembly will simply slide in and out of the mantlet hole:
I have already started plating the outer skin, should have more pictures up later this week!
Nate