After sliding off the side panel, we found the bag of screws/plastic feet and a piece of warranty information. We were half expecting to find an installation guide, but we didn't. This is not a major impediment as we could easily locate the PDF version of it from Antec's website. On the base of the motherboard tray, you'll find two rudimentary cut-outs in the vertical and horizontal orientations for cable routing. There are also two reusable cable ties to corral up those wild tangles of wires. As we started our installation of the motherboard, we had to bring out our screwdriver as this is unfortunately not a tool-free chassis.
We had to refer to the online manual to take the guesswork out of mounting the two optional front 120mm fans. Usually this a straightforward affair, but it wasn't so on the One Hundred. We also had doubts about cleaning the fan filters held in place by pliable wire mesh strips as they seem fragile and may break off after repeated bending in the long run.
For those worried about space, we are happy to report that the One Hundred Window is sufficiently spacious for its range of budget casings as it can accommodate two 11-inch graphics cards (such as the older AMD Radeon HD 3870 X2 we had on hand, which is about the size of current mid-range graphics cards) without having to sacrifice any 3.5-inch drive bays. We had to perform the usual drill of removing the back expansion slot plates for the graphics card installation. Like the Two Hundred case, once the slot covers are pried out, you don't have anything to cover them with again. These are traits typical of budget casings, but we have actually seen better from our previous bout of budget casing comparisons.
The installation of the bottom-mounted PSU (power supply unit) took a bit of guesswork as there was no wire mesh opening at the bottom of the chassis. While attempting to install the PSU, we noticed that the only way to mount it was by removing the PSU's own back panel screws. Yes, you read correct. While we've seen several casings come and go in our lab, we really can't recall when we had to dismantle the PSU's own rear screws to align the PSU in place and fasten it to the chassis with the same set of screws removed earlier. Even so, the holes on the back panel of the PSU were a little misaligned against the chassis counterpart; the screws were refastened with force after the PSU was in place. And note that in its final rest position, the PSU's fan faced up into the case.
So far, the One Hundred case has some similarities to the Two Hundred model internally like the need for a screwdriver, but still makes minor improvements like using a matte black interior for better appearances, more cut-outs for cable routing and a tad more spacious interior. Sans a few installation quirks, most people would likely prefer this newcomer to the Two Hundred.