The most prominent feature of the inside of the P182 is the power supply chamber. A black panel with a sliding door isolate the power supply from the rest of the case, effectively reducing the heat of the motherboard chamber. Thumbscrews hold the device in place, and can be easily removed to close the sliding panel or remove the separator altogether. The power supply also sits in its own cage, keeping it off a major surface and suspended behind a fan.
The inside rear has the fan and the other side of the water-cooling tube holes.
The 3.5" drive cages are removable and have pull rings to help! The top cage has rails, but the lower doesn't.
The 5.25" bays have rails in the parts box.
Sorry, boys and girls, no motherboard tray on this model.