THE P380 INTERIOR
As mentioned already both side panels are dressed with noise-dampening material on the interior.
In terms of interior space the P380 seems to be doing great.
Strangely enough there are two 5.25" drive bays inside the case without any type of tool-free locking mechanism.
Right beneath that we find 3 drive cages which can hold a total of eight 3.5/2.5" drives.
The drive trays are quite sturdy and feature noise-absorbing silicon pads (unfortunately you need to screw the drives on them).
Unfortunately to remove the 3 drive cages you first need to remove 6 regular screws from the interior (that's not the end of it however).
You also need to remove the front fascia and to do that you need to first remove 3 round screws placed on each side as seen above (two more are placed on the base of the fascia).
After you remove the fascia you will also notice that it features a vertical side slim optical drive bay (unfortunately not visible in this picture).
By removing the fascia you now have access to the front fan/radiator and the 12 screws you will need to remove in order to release the 3 drive cages.
As you can all see the standoffs are already installed on the mainboard tray (there are also 4 grommets for cable routing).
All 9 PCI expansion slots feature regular thumbscrews.
The PSU area is pretty standard but the removable air-filter is not something we see with every tower.
Moving at the rear we see that Antec has equipped the P380 with a 6-way fan hub powered by a Molex port (all 3 pre-installed fans feature individual speed controllers which unfortunately are not accessible from the exterior).
There's not much room behind the mainboard tray for cable routing purposes but it should be sufficient (not that we see more in most towers).
Here you can see the top fan/radiator area from within the tower.