It's on page 13. The Picture is at the bottom right.
How to remove the HDD cage
> Locate and remove the two screws securing the
cage to the base on the bottom of the case.
> Pull the HDD cage out.
> HDD cages are stackable and can be installed on top of
each other or completely removed for improved cooling
Can I add some sort of mod that might include a stronger cage?
It's very flimsy.