I was hoping that this was a regular computer case but it looks like it has no expansion slots on the back. Unfortunately, you don't see computer cases anymore with large numbers of hot-swap bays. The best case I found was made by Lian-Li and had 7 internal hot-swap bays and 5 5.25" bays in the front for DVD drives and other devices. Since that time, I haven't found any case that caters to those with large storage requirements.
If that's what you want, you'd probably have the most luck searching for
pedestal server cases. Some of them come with hot swappable caddies built in, others have a number of external 5.25" bays in which
hot swappable modules can be installed. They may make sacrifices in other areas you are used to though, like airflow, fan mounting options, radiator capacity, etc, as they aren't really intended for desktops.
(Note, not endorsing Newegg, but their categories are still the easiest to search for examples)
Mass storage has moved away from the client side of things in the last 10-15 years.
Clients tend to just have enough storage to run their programs and working files, with mass storage occurring on NAS units, or servers, or even in the cloud.