The Fractal Arc supports your standard ATX motherboards as well as Mini ITX, Micro ATX. Motherboard installation is pretty typical, install the nine standoffs and secure with screws.
To install an expansion card you don’t need any tools. Just simply remove the thumbscrews for the slots you need to use, remove the covers, attach your card and secure with the thumbscrews you removed.
Like I mentioned before you can swap the top hard drive cage around by removing a two thumbscrews and switching its position; here’s how it looks.
To install a 3.5” drive simply flip the drive over, line up the four holes with the rubber grommets and secure.
The same concept applies for 2.5” drives, except that you don’t have any rubber grommets (not really necessary since 2.5” drives are typically SSDs and don’t have any moving parts). Just simply attach the four small screws to secure it to the hard drive tray.
You can then lock your drives back into place and install the cage back in, if you had previously removed it. I’d recommend removing the cage as it’s a little easier to work with when it’s out of the case.
To install a 5.25” drive you have to remove the front panel, which is relatively easy to do. Just simply pull out on the bottom and it should snap out. Once you get it removed you can pop out the cover blocking the bay and pop in another 140mm fan if you so choose. This requires a simple snap feature, so no screws are necessary.
To actually install the drive simply reattach the front bezel, slide in your drive, align with the holes and secure with two (or four) thumbscrews.
There’s plenty of room to manage your cables in the back and plenty of places to send them from front to back as well. The case looks pretty nice even if you don’t spend too much time routing your cables.