After a weekend of arcade goodness, I can say that the magnets hold up great. The control panel is easy to remove, but feels like it's locked down when mounted.
It's really slim against the wall, but still very Arcade!. I approve!
Specs :
i5-3570K 3.8 Ghz
Dell - 7040 Logic Board
16GB Ram
1TB Crucial MX500 SSD
Nvidia 1060 3GB GPU
Sharkoon SilentStorm SFX Gold PC Power Supply (500 Watt, SFX, Cable Management)
GigaWorks T40 Series II 2.0 High-end Speakers
Acer Nitro VG270 Monitor 27 Inch 19:6 1920x1080
SANWA JLF-TP-8YT-SK joysticks with octagonal restrictor standard spring
HQ Classic Concave pushbuttons with Cherry D44X microswitches
Xinmotek 2-Player USB Controller
i-pac USB Controller
Coolwhite brightness adjustable ledstrip behind marquee
2 top air vents with fans
Plexiglass panel in front of the LCD is a UV-resistant/absorbent, High break resistance and surface hardness, 49% Light Transmission, transparent, high-gloss
Plexiglass panel holding the marquee is a UV-resistant/absorbent, High break resistance and surface hardness, 92% Light Transmission, transparent, high-gloss
Windows 10
Coinops frontend
Mame and some BGFX/HLSL goodness
Still need to do some software and visual tweaking, but it's playable.