Since I've been making custom N64 box art lately, I figured I would make things easier for anyone else looking to do the same by making a template for Pixelmator and Photoshop that matches the layout of an unfolded N64 NTSC-U box!
It's already split up into groups/layers for each side of the box and its associated background color fills, so if you'd like to make your own changes to the template, it should be pretty easy to do. I added a link below to the Google Drive share where I uploaded the templates. Have fun!