Nice work, clean masking, how did you do it?
I like it!
Ditto on the vision blocks, how did you do them?
The Thermal cover on the barrel was canvas-type material, so aught not to be glossy, tone it down a little?
Also the main gun requires an internal mantlet cover, from around the barrel up to the metal strip with bolts on it around the turret opening.
I used plasticene to fill the gap, & painting the 'canvas' with PVA, but this had the effect of fixing the elevation.
The Co-axial MG to the left of the barrel is slaved to the barrel elevation, btw.