I was an EAPSI fellow in Japan this past summer and here's how I organized those sections in my application (not sure if they've changed the requirements). My Project Summary was a little less than a page long and split into two paragraphs, one for Intellectual Merit and the other for Broader Impacts. For the Project Description I put each section under its own bold header and allotted 1 paragraph for the synopsis, the rest of that first page for the timeline (1 short statement per week), about 1 page for background, 1 page for the research plan, 1 page for proposed host and justification (in addition to my primary host I visited 2 other labs and gave overviews of the main scientists there too), about half a page for the cultural and scientific value, and a 2-sentence paragraph about my advisor in the US. With 3 moderate sized figures that easily filled up 5 pages. Hopefully that's helpful for you.
