I'm thinking about doing this, a single shelf has as much square footage as nearly 2 Detolf cabinets. The PAX cabinets are completely modular and you can use all sorts of different shelves and inserts with them.
You can buy the outer wardrobe container like this:
...and add a couple of glass shelves like these:
Then at the bottom add some of these drawer trays:
...and get one of these tray liners for all your weapons:
The drawer trays will sort of look like this except full of weapons:
You could even separate areas like so:
That gives you some cube storage with small drawers on the right side. Or you could use it to separate some areas for larger figures where the shelf can't go all the way across.