Some things that I wonder about with those types of vintage models is the original size of the magazine page, the color of the page, and how vibrant the colors of the model were when originally published.
The pages of the scans are all browned with age probably because of the acid content of the paper. But I have seen some old magazines printed on light brown paper or off-white paper like newsprint.
When I clean those scans I tend to play around with the color settings trying to get an aesthetic compromise.