The interior of the Elite 310 is pretty simple. The motherboard has some random holes in it, which really can’t be used for cable management or changing your CPU cooler. Towards the front of the case is a hard drive cage, facing towards the outside of the case, which holds five 3.5” drives.
Above the hard drive cage are two more 3.5” drives, facing towards the inside of the case; one external and one internal. Above that are the four external 5.25” drive bays.
Towards the rear of the case are the seven expansion slots which are built right into the case, so you have to remove them permanently from the case, rather than being able to place them back on the slots. Above that is the only fan inside of the case, a black 120mm fan.