Out of the 62 Jumbo issues with Skygirl, I am missing around 20. They are:
Jumbo 68,69,71,74-78,80,82,87,95,107,108,110,113,117,118,121,123,129
There is a total of 370 pages of Skygirl material all of which is drawn by Matt Baker except the 6 page introduction story from Jumbo 68. That is by Alex Blum. There is a large amount of overlap with Ghost Gallery and ZX-5 by Jack Kamen (with a couple Baker stories) in these issues. I have also started mapping out those books as well. The Kamen interiors are pretty solid and worth being seen again by a modern audience.