A few Machines included now and possibly in the future do not contain textures.  This means if you download the mod you will get a purple machine with no textures but I have made the process Simple and Have a few suggestions on what mod I find to be best fitting for the machines I do not include a texture for. 

To make things simple when you download a texture override for a nuka cola machine you will rename the .dds files to 
SodaMachine_d.DDS
SodaMachine_n.DDS
SodaMachine_s.DDS

and you will put them in a folder listed below where the suggestions are 
so those 3 files will be located in the following path in their own mod
textures\setdressing\NEWFOLDER
or if you want anytime I do not include the texture I leave the file structure intact in that mod so you could just drag and drop. 


Nuka Can Machine 
NEWFOLDER = NukaCansMachine
Suggested Skin: Art Deco Nuka-Cola machine

Nuka Cola Classic Machine 
NEWFOLDER = ClassicNukaColaMachine
Suggested Skin: Better Nuka-Cola Machine (I like the 4k no side posters)