Case help, please

I need better storage for my throws, but I’m not a huge fan of anything I see that’s currently available. Ideally I’d like something double sided that lays flat and holds a decent amount (looking at you, FD50). I don’t mind doing the internals/inserts myself, but am having a tough time finding a hard case that meets these criteria. Anybody know who manufactured the FD50 case or know where something similar is available? I see a bunch of cases that look identical in terms of general build, but none that are two-sided and lay flat…