Before further discussions on our Panzer IV revision project, think we should let you know the references we are using (besides online references).
Most referenced publications are:
PzKpfw IV in action - Squadron/Signal Publications, Armor No 12, by Bruce Culver
Panzerkampfwagen IV and its variants 1935-1945, Book 2 - Schiffer Military History, by Walter Spielberger, Hilary Doyle, Thomas Jentz
plus a few others.
Also ordered Panzer Tracts No 4-3 Panzerkampfwagen IV Ausf H and Ausf J, 1943 to 1945 - Hilary Doyle, Lukas Friedli, Thomas Jentz
but not delivered yet.