To access the interior, remove fourteen screws to detach the bottom panel, and another four to remove the top panel. Raijintek made sure the bottom is held in place securely while keeping the top panel as clean as possible by only going for the sides. Three cross beams within the Pan Slim add to the overall case integrity, which is nice to see.
The interior can be divided into separate quadrants. Starting from the left, there is the PSU area with storage in front of it. Next to that is the area dedicated purely to your GPU. As you can see, there are mounting possibilities for 120 mm fans here as well, so you could easily improve cooling to your dual-slot card or go as far as to utilize a Raijintek Morpheus GPU heatsink and mount fans to the floor of the Pan Slim. The third strip holds a classic ITX mounting layout and additional storage in the front. Lastly, the far right quadrant allows you to install two more 120 mm fans or a liquid-cooling setup of up to 240 mm. Unfortunately, there are no cable hooks anywhere, but as this is a desktop case, you are only routing horizontally, which should make it a little easier.
Taking a quick look at the two mentioned storage options, the bigger cage by the motherboard can hold two 3.5" and one 2.5" drive, while the smaller one opposite of the PSU bay is meant for three 2.5" drives. Having the ability to install six hard drives is great if you want nothing but storage and use the PCIe slot for a RAID controller, as most consumer-grade ITX motherboards only come with four SATA ports.
Another noteworthy element in the front is the metal GPU support piece. It will really help keep your GPU level, which is both useful and important, especially if you opt for additional fans on the floor of the chassis.
All the cables within the Raijintek Pan Slim are black, and the Type-C variant is even flat for easier routing. As the case lacks a reset or HDD activity LED, you will get connectors for just the power button and its LED. Some may argue that having an HDD activity LED could be useful, especially if the system's storage is comprised exclusively of SSDs.