Hello everyone,
I have a javascript application which looks like this:

I am trying to change it to use a modified version of the "Map container split in three" template:
https://developers.arcgis.com/javascript/jssamples/layout_mapcontainersplitinthree.html
My goal is to have something that looks like this:

But what I've got (after moving my code over) is this:

I've attached the files I modified in an attempt to get my code working in the new template. Thanks for the help, it's very appreciated!
Chris