Use horizontal arrangement, with pictures on the left and lists of papers on the right of the pictures, as some kind of bullet list instead of the horizontal line separators, and with fixed left margin/table column (so that the lists keep the left margin and don't flow around the pictures). Stack the three categories one below another. Not sure how that'd look though, but the extra-space problem will go away.

Anyway, the issue is already mostly fixed with the papers placed at the bottom, and the summary link is visible now.