Fantastic job!

The size should be the exact same size as the front. The raised area on the back cover should fit inside of the rest of the box. Fitment is sometimes tight if fuzzy skin was left on for the rear cover. I will check the print profile and see if I forgot to remove that for the rear cover.

I have checked the files and everything appears to be correct. I did note that this model does have some sharp corner area near the top of the box. These have been known to cause some fitment issues on other boxes as the tolerances are very tight. I would suggest taking some sandpapaer and rounding these areas on the iside of the box. When applying the rear cover you may find it easier to try and fit these areas first and then move onto the rest of the cover. If you are still unable to fit the rear cover, please let me know and I can try to smooth / round those around in the design to help it to fit easier

I ended up shrinking the back of it to 98.30% for the X and Y axis and that seemed to work. I agree with the sharp corner of the box being tight. Even with shrinking it, it still was tight getting the back on. Love the print though. Thanks for getting back to me.