Currently, I'm looking for more pieces of the Zak artwork. Most magazines ran all the same adverts, or used the same material provided to the press, and most of the time they were either cropped or too small to be of much use. Newer uses of the art (for digital releases or retro gaming articles, for example) usually just retouched the art themselves (many times using my poster as a basis), more or less successfully:
One of the more obscure versions was sent to me by @sanguinehearts, from the cover of the Australian magazine "Eagle and Wildcat":
That was very helpful to remove a lot of the text at the bottom:
Clearly this needs more work to blend better and match the detail from the box-scan, but it's already much better than the low-res manual I used for that on my old version.
I could still use a good scan of the KIXX box, but as I understand, it's very difficult to scan it completely flat (and thus in-focus). All scans I have of this are blurry.