This is the box I use to store my 76mm ATGs. The small white box is where I store my excess parts or bits that fall or get knocked off. Every storage box has one of these in it.
These guns are part of a WWII Soviet Tank Corp that has 39 of these guns.
This box holds the crew figures.
The boxes are lined with corduroy to keep them from sliding around.
The corduroy is held in place by shelf lining.
All in all it seems a reasonable way to store the collection.