First I am cheap. Then I am unemployed. And lastly it is foolish to travel to the next big city to find a padded pelican case and pay for it as much as the kit costs, AND as much for gas money. So an old Tupperware brand food container was used. See, I do try for quality when I can!
So I started with placing a carton sheet on the bottom of the box, and continued by laying the items, and marking the dividers position. Then I removed the carton, made the dividers and glued them on. Then I proceeded with gluing thin packing foam sheet.
With a bit thicker packing foam I covered the bottom of the compartments and I also cut a covering sheet by the same material.
And I ended up with the following. Not pretty, but functional, and easy enough for your kid to do.