I have just recieved an AFV Club T-34/76 1942 (Factory 112) and I was wondering what would be needed if I were to convert it to a Stz version (the one with the wedge shaped mantlet), I would also like too have some "spider" wheels with tyres in a couple of places.
I would like to have it as a late '42 scenario and was wondering whether the turret would have the additional armour (not the bedspring seen in Berlin).
Any information would be greatly appreciated.
It's not worth the effort. T-34s were built differently by each factory, particularly in 1942. The tanks from STZ had a different turret, different hull and different suspension from the AFV kit, which is a T-34 from Krasnoe SOrmovo. These were also used around Stalingrad, but are substantially different from STZ tanks.
If you search STZ T-34s you will find many threads. DML has a kit #6388 for the tank you describe, although the upper hull is too long by 2mm ahead of the turret ring and that spoils the fit. It can be fixed, or mated with another DML hull. STZ tanks had unique method of assembling hull plates as well as a unique style of turret and suspension. DML has another kit, #6355 that represents an STZ tank from October 1941 production batches. Either of those are better places to start to build the tank you describe... to a point.
Supplemental armour was added by all factories, briefly, but only Krasnoe Sormovo added armour to the turret. Those tanks had the small round transmission hatch, unique to Zavod No.112 and used during that period. DML has another kit, #6452 that represents that configuration. Their kit #6479 is of a later Sormovo tank, and is a direct comparison to the AFV kit.
STZ did not use rubber-tired wheels, and their steel roadwheels lacked the ring around the relief holes that appeared on similar wheels made in the Urals. UTZ and eventually ChKZ and UTZM made T-34s there which featured cast rubber wheels on the first and last axle with steel roadwheels between, as you describe. All but the very first tanks from the Ural factories had the six-sided turret and 500mm tracks in different styles. STZ continued to use steel wheels. Krasnoe Sormovo used stamped wheels throughout the war, as did Zavod No.174 in Omsk.
What you have is a decent model of a T-34 from Krasnoe Sormovo, appropriate to the period from May 1942 to mid-1943, when they finally switched to the new turret. You can place it around Stalingrad in 1942 or at Kursk in 1943, with appropriate fuel cells and other fittings. If you want a chisel mantlet and steel wheels, you're talking about a tank from STZ, which is a different animal. For that, DML gives a poor starting point, but apart from the TMD resin kit, that's what there is.