All in theory, I am by no means going to do this build at this moment. Maybe in the future if anyone has some decent hypothetical (or real world is even better) benchmarks.
As the title implies; as small as possible build in a case that has a carrying handle (Otherwise it just wouldn't be a lunchbox without the handle)
The main concern with this build is being as small a form factor as possible while still being able to run most games at reasonably decent performance (like Med settings 1080p 40-ish fps)
But, bonus internet points if you can push past that benchmark. Budget is not an issue.
Also even more bonus internet points the more lunch-boxier you can make it (if you know of any very lunchboxy cases or anything)
Here's a mock-up build:
http://pcpartpicker.com/p/3Qa41
At this point I realize it's quite the expensive lunchbox, so if you have any suggestions where to cut corners to lower the price that would be great. I figured it might be possible to really cheapen it if I forego the SSD but I'm not sure if it's worth it.
ALSO, it needs a CPU cooler. I was thinking a tower-styled heatsync with a push-pull fan config to help not only cool the CPU but would provide better ambient temperatures too since that's probably pretty important for a small build. However, according to PCpartPicker the only aftermarket cooler was a low profile one. I'm not entirely sure how things would be set up in the case, but I did do a brief measurement take in comparison to my full-tower PC and it's width is as wide as mine, which means it should support a tower-styled heatsync.