I was hoping to understand more from you regarding the finishing. How was a gloss finish achieved on the inward facing surfaces (the panels around the sub driver, the braces on the NX-Otica etc)? All the videos I've watched about sanding, buffing and polishing use random orbital sanders or circular pads which would not be able to access the corners where three surfaces meet (like where I've circled in one of your photos).
In finishing projects like this, there are a few tricks to be done to insure quality gloss levels inside corners like this. First off, really knowing the materials and flash times between coats is an absolute must. We always joke there are many applicators in body shops, but very few painters. Secondly, for a body shop to be able to use slower reducers and hardeners when spraying is very helpful, but again a critical issue is they must know the product well to manipulate this. This tactic is fantastic to let everything really level out smooth, but can easily lead to disaster if complacent. Third, for the "in case $#!+" purposes there is always the ability to sand and polish by hand any debris and texture. I would recommend stocking up on ibuprofen if option 3 is used.
Most of the time the super glass smooth gloss finish is a "Good enough" scenario on the back corners. In those instances, sand and buff out what you can but the tight 3 wall corners might have a little orange peel in there.