Very interesting!
I was wondering if this is going to be different version of T-34/85 from the one you already make?
Looking at the pictures, most Vietnamese T-34/85 were model 1945 manufactured by plant #183.
Factory 183 version model 1945 had distinctive flattened turret with bulge on the left front, larger cupola (slightly extended on the side), singe commander hatch, flat fenders, full spider wheels with tires without perforation. Some had dished wheels with tires without perforation
It was the most common version of T-34/85 at the last stage of WWII and Korean war.