Assembly
Before you glue the top page to the bottom page, attach the pictures where and how you want them to the back of the top sheet with painters tape.
Now you can attach the two pages together with the top page centered on the bottom page. Glue the embellishments to the top page where you want them.
Your St Louis Scrapbook page is finished. If you want a two page layout just repeat the cutting process to make a second page.