Dave,
First I would like to thank you for posting the link to your files. As I wrote earlier, I don't know much of anything about 3D printing. I have built some things in Fusion 360 and used a small mill to cut them out but that's 2D and it has nothing to do with extruding plastic.
I have some questions:
(1) Are all of the files listed required to make the case (guessing the answer is yes)
(2) Do you have a 3D printer recommendation?
(3) How long did it take you to print the case components?
I probably have more questions but 3D printing is kind of off topic for this group so I'll stop here
73
NE5U
Mike