OK, I duplicated the file named "Face_death.tga" in the 3DO/Plane/TEXTURES folder and renamed its duplicate as "Face_Germ3_death.tga".
Now I have two additional files in my Textures folder that were duplicated from similarly named files: Face_Germ3_death.tga and drelich_lift_m.tga
I made the changes to the hier_A13 file that you recommended to remove the additional turrets, then tried again to load the JU-88A-13 with the modifications you provided, along with the two additional TEXTURES files noted above. The result : the aircraft loaded just fine, there were no errors to be found in the log file and the pilots looked good to me!
... THX for fixing the bug yourself ...!
My fault in fact, as this was my first attempt at releasing Ranwers elegant style aircraft with new pilots/gunners, with only the necessary files + hier.him, but I must have forgotten to check all mat files, as the ones with an "m" or also Face_Germ3,_death, and drelich_lift_m, were used by Zdenek in his Ju-88A-4 ...
In fact there are two different ways to modify pilots/gunner in an aircraft :
Ranwers light and elegant way, with the advantage of being able to revert back to the previous pilots/gunners, simply by deleting the aircraft folder inside the PILOTS folder ...
Or the more definitive way that I use in most cases, that consists in editing the original aircraft folder, by adding the new pilots mesh files + mat files, plus editing the hier.him too, and also using only the necessary textures ...
I'll be more careful in the future ...