When looking at the wing tips metal structure and hatches  of the Ju88 A-1 shown in the drawings vs those of the surviving Ju88 you can clearly see the wing extension that Junkers used. This is visible  a 1m or so leading edge extension and a smaller hatch at the end of the wing.

I cannot see a hatch in the leading edge extension in any image or plan of a Ju88 ( or 188).

Looking into other Ju aircraft that saw service in Stalingrad I have been checking the Ju90 – based on the 90 part number. There was one loss at Pitomnik  – an original Lufthansa Ju90 with the large Ju86 wing. The technical drawings  of the Ju90 tail show no hatches in the  leading edge.

The Ju90 went through several iterations in wing and engine – the Ju86 wing was changed to a straighter Ju90 wing and then this was extended. But no other Ju90 was lost at Pitomnik/Stalingrad.

The last of the Ju90 aircraft V11 which had the Ju90 extended wing was converted into a Ju290 V1 that was lost at Pitomnik.

The Ju290 tail was straight so not tail!

There were other Ju290’s lost over the Eastern front as well.

With the yellow paint over the RLM65 blue paint it fits with images of Ju 90’s and 290’s with yellow wing tips.

Unfortunately I cannot get any clear pictures or good drawings of the Ju90 ( second wing or extended second wing) or 290 wing leading edges to confirm which ( if any) had access hatches.

I acquired a Junkers standard hatch and it fits into the hatch opening perfectly.

Any suggestions welcome.