So I have assembled the kit to this point. There are a lot of options, the best bet is to find a prototype and then choose the parts to match.
I chose the "Cast" turret with the two periscopes, the Stalingrad sale gun mantlet and the all steel wheels. A late style engine access hatch was used at the back.
I was just going to build it "out of the box", but ended up adding some hand rails, using the Bill Bedford hand rail jig.