This drawing is not of a final production model Tiger II. Final production models had 18 tooth drive sprockets with single-link Kgs 73/800/152 tracks, not the 9 tooth sprocket, double-link, Gs 26/800/300 tracks as seen here, 6 sets of single-link track hangers per side and 5 rings welded to the turret sides for securing camouflage, along with many other features not visible on this drawing. I have several photos of numerous completed turrets sitting on blocks at the Henschel factory when it was captured by American forces at the end of March, 1945. All of these turrets are armed with 88mm Kw.K. 43 L/71 guns. Why would Henschel interupt production to completely rebuilt the interior of a Tiger II to accommodate a 75mm Kw.K. 42 L/70 gun, when there is no shortage of 88mm guns and it has spare 88mm armed turrets sitting on blocks? If this was the last vehicle to roll out the door and there weren't any extra guns or turrets laying around, I could MAYBE see this happening, but this is not the case. What happened is some author sees a photo of a scuttled Tiger II, just like the one I posted earlier and comes to the conclusion that this is a new variant, without any production records, text or anything else to back up his claim. Besides, the barrel depicted in the drawing isn't even long enough to be the 5.535 meter long Kw.K 42, it would barely make an L/48.
P.S. The photo I posted most likely IS the source of this author's confusion, since this photo is a Tiger II of Schwere SS-Panzerabteilung 502 in the Seelow Heights Sector, taken on March 28th 1945. Compare the drawing with the photo. Both have the splinter-pattern camo on the hull sides and irregular blotches of color on the turret, just as the caption on the drawing states.
I also have this unit's entire operational history, just in case anyone needs to know.