Most of this build description will be composed of my experience with working with this case since most of the parts chosen are self-explanatory.
Thermaltake's Core V1 Mini-ITX case comes in relatively cheap and has the notable feature of being able to remove the side, top, front, and bottom panels. The top and side panels, held in place by thumbscrews, are interchangeable, though I have kept the panels in their original configurations to provide air vents for the graphics card and hard drives as well as keep dust from entering the case from the top. Room for cable management is provided at the bottom next to the power supply. The motherboard is laid horizontally, with plenty of vertical space for larger CPU fans or water cooling, though top mounted case fans are not an option.
I found that mounting the 10.55" graphics card took some effort, but was manageable in the end. The power cables are connected to it at the very top corner as well and fit only by bending the cables right at the connection.
The hard drives, mounted on the other side of the case, are connected to their respective cables from the top. There is little room to manage the cables here, especially so since my build contains 2 hard drives and 2 SSDs. The hard drives are also located at the bottom, meaning the cable always extend vertically before any cable management can be done. Cable management would be significantly easier for anyone running a single SSD, a single HDD, or both, as in that case, the drives would be positioned near the front of the case where the hole for bottom cable management is.
For ventilation, the front of the case takes a large variety of fans as well as room for a radiator. The rear of the case has room for 2 80mm fans, which, as a general rule, do not circulate much air. Poor cable management and large water cooling loops can especially hinder heat dissipation, which is vital in smaller form factor PCs. Several other Core V1 owners have set the vented side panels at the top and mounted fans on the grills through their own means as a form of makeshift top fans, though I am not nearly as adventurous.
As for the case's appearance, it is quite attractive with its cuboid shape. Its removable panels easily allowed me to spray paint the side and top panels. The top panel and front portion of the case required some disassembly before painting, however. The top panel's clear plastic is removed by bending its clasps 45 degrees, after which the plastic can be pushed out. The front is composed of three parts: the front grill, a dust filter, and the frame. The front is disassembled in the same way. The Thermaltake logo is not removable, though, and required me to mask it; luckily, though, the area surrounding the logo is depressed inwards, making masking as simple as making sure the masking tape filled in the area. Luckily the paint did not leak or pool in the area. The rest of the case is not painted simply because masking the front I/O ports and cable would be tedious not to mention risky. The paint used was Krylon Paint+Primer Satin Oxford Blue. Adding a strip of LEDs would certainly add to the appearance, though I personally prefer its simplicity.