Hello again WackYWings,
This problem you see is also seen on the original aircraft, before this new radiator upgrade.
I thought you meant something else.
I am not 100% sure, but,
It might be a problem in the 3d-modeling, because I have crossed checked some files of the Oeffag series
with the Albatross D.III - which seems to share a common fuselage.
So far I have not come across which lines might be missing which cause this effect of the "transparency".
I remember along time ago someone once mentioned something about a "Hidden" word which might be missing, or must be
added to some of the files, for this to be fixed. Looking at the Albatross files and the Oeffag files side-by-side, they seem to be
almost the same and I did not notice any missing "hidden" word on them.
From what I understand, it has nothing to do with the alpha-channels on a skin (to make holes or Transparency in the model),
because after you create these, then you would have to change some lines inside the files for it to become "transparent",
but this does not seem to look like this particular problem. I could look into it again and do some tests again.
I don´t know,
Perhaps it has to do with the 3d-modeling (?)
Perhaps, Von Oben might be already aware of these problems and is doing these fixes for the Oeffag series.