It was very easy to add to my pcbway order. They manage to get it from shenzen to my door in a week. The box now costs 12 euro. It is very accurate, snap fit and 100 micron tolerance. You can print text on it, change color and I have a similar process at home (laser cutter). The problem with my laser cutter is that acrylic is too brittle and POM warps due to heat. A more professional plastic enclosure makes sense, later on.
Also see https://hackaday.com/2021/09/15/the-many-ways-to-solve-your-enclosure-problems/

I'm a bit baffled as to why you decided to choose to use PCBs to construct a box.  It's entirely possible to get plastic enclosures custom made ( https://envplastics.com/project-applications/plastic-enclosures ) or have existing enclosures modified ( https://toolless.com/standard-plastic-enclosures/ ) for your needs.