According to the review posted on Track-Link, Tamiya based this model on their earlier 1/48th scale kit, which apparently was based on an actual vehicle;
"This kit features more "early" features than what Tamiya call "middle". The hull is basically a very early hull that is missing the rear-most left and right hatches on the engine deck, these were for fuel and radiator filling. However the small hatch in the commander's hatch is present. The early muffler without the heat guard is depicted, the heat guard was dropped at about the same time as the three little hatches were introduced. Three "pilsen" are depicted on the hull roof too. Tamiya have provided the later light weight mantlet and Type V housing too. This was introduced after the aforementioned features, so it is odd that the two small hatches are missing from the rear plate. Studying available wartime photographs do show vehicles with these features and not others, there wasn't a definite cutoff time that certain features appeared and others stopped. German manufacturers used a FILO (first in - last out) production method. The specific example in this kit is illustrated in Panzer Tracts (ref.2) pages 9-6 and 9-7."
I almost wonder if this vehicle was a rebuilt wreck, due to the widely-ranging time line of design features seen on this model. If this is the case, it renders discussion of which features should be present a rather moot point. In any case, the exhaust heat shield was still present on a known late June assembled vehicle, later deleted during July production. The July production vehicles still retained the perforated S-hook "tool box", the holes deleted in August. The cooling air outlet screen with the sliding cover should be present.