Will change, thank you.
The colors?
1- Make a folder called Vehicle_SoapBox or whatever you want to name the .zip as
2- put your textures/colors in there
3- assign them to the model in your modeling program FROM that Vehicle_SoapBox folder
4- Extract into the folder, put in whatever else you want/need to include and compress the contents into a .zip by going into the folder, selecting everything and adding it to a zip file. DON'T compress the folder, otherwise your .zip will contain the folder and the contents inside.
Edit: You need to assign the textures by creating new Materials, loading the textures to those materials, and then assigning the materials to your model bits. Fun fact: usually the file address is what the individual material keeps, not the file itself. That's why you need to be careful from where you load the textures.