This being my second PC build ever, the putting-hardware-together part was the easiest and funnest part of the whole thing. Getting the thing to properly POST and into BIOS was the worst.
Always wanted to do the boxes shot. The plain small box contains the Samsung M.2 SSD, no fancy box.
I find checklists helpful, lest my excitement makes me overlook a step.
Look ma, no SATA cables! Samsung doesn't give you the necessary bolt and screw to install this thing. Asus provides them with the motherboard. A smaller Phillips screwdriver is recommended.
Fractal's Define S case was overall very easy to build in. Love the direct airflow path of my intake fans. The I/O shield gave me fits, as usual. Screw that thing. Cable management was a breeze and I didn't need to re-organize my cables. Lack of SATA cables helped.
Only required a single zip tie, the rest was managed with the four velcro straps supplied by Fractal. Seasonic for some reason provides you with three Velcro straps, too.
Lessons learned:
1. Use the OP when you're stuck. I couldn't POST, then remembered the troubleshooting checklist by Hazaro, and I discovered a bad RAM stick. Crucial, why you do this to me.
2. The NH-D15 front fan will still need to be raised a little bit to accommodate the RAM, even if they don't have raised heatsinks. I had to raise mine by a couple millimeters.
3. The Asus Z170-A motherboard doesn't include a jumper to clear out your CMOS. I had to use my screwdriver to short-circuit the two pins. You need a microscope to understand Asus' diagram of which two pins to short.
Thanks for all the help, PC-GAF!