1) Make a big brochure or catalog as one image.
2) Cut it up into smaller images or Tiles
3) Make a table in an email
4) Insert the images into each table cell in the correct order
Set table border and margins to 0px thickness
5) Click on each image and add a hyperlink to wherever you want to send it.
That is one way I used to do it. But probably wouldn't want to use tables these days, as they won't be mobile friendly. With mailchimp, you can divide up images into columns/cells. eg 3x9 arrangement. So on a small screen each cell should appear as vertical list as images eg on a 1x27 arrangement. With tables, it won't do this, so unless you zoom on, you won't be able to clearly see the images clearly.