I am currently constructing dragon Syrian T-34/85 .6-days war series.I follow what the instruction said, But I realized,If you put the MG rig on top of the commander cupola, the TK commander can not open the hatch,I wonder if there's an error,it's the other way around,But the commander periscope mounted on the cupola is little bit bigger than the rig.
Unless I see the real close in photo syrian T-34/85's Duskha 12.7mm HMG rig ,I feel very difficult to continue the project.

Here's a link to an image of the cupola with the MG ring. It appears that the hatch will have no issues opening.

http://63.135.101.110/d-m-propics/DIR_DRA/DRA3571/G_DRA3571_02.jpg

Got a pic of your work? Maybe we can determine where you went wrong if we can see what you've done so far.

Steve