I am not the OP but felt completely inspired to go out and start a similar project. I don't think I am nearly as crafty but wanted to share my thoughts on how others in the same not so crafty boat my be able to replicate her book.
I went to ACMoore and found a spiral bound scrapbook to use as a starting point. The one I picked up is a Canson 6" x 6" in white, similar to this (although this one does have white pages inside). It was over in the scrapbook/photo album area.
Then I came home and deconstructed the book so I had pre punched pages to print on. I made up a "daily" insert similar to the op's, slightly more generic though so I didn't have to make a new one for each day. I also made a few extra pages for Epcot notes since I want my kids to think a little about each country as we explore. All of my pages are below.
I still need to track down the photo inserts, and will probably end up cutting some custom dividers (I LOVE the OP's), but worst case is I can buy stick on divider tabs at an office supply store and print out a DISign on the pages used as dividers. I also need way more pages than the 20 my book came with, so will either have to cut/punch those myself or head down to kinkos and have them cut some blank card stock for me to print on. Then some magic will need to be performed dressing up the front and back covers and inside cover, but I'm thinking some glitter and specialty stickers from the scrapbook aisle will get me close.
Here are the pages I did for my insert, scaled to print at 6.5" x 6" which is what the inside pages for the Canson book are. It also allows space on the left to accommodate for the spiral binding. FYI I printed on a laser printer so it was pulled through by rollers vs an inkjet going side to side... I'm not sure that will make a difference in the printing on pre punched pages but it may.
Daily page - (the one I am using for my kids is the 2nd version)
Epcot pages