Thanks for all the initial feedback! I didn't expect to get this much attention from this. =P
Everyone seems to be interested in the airflow. I run it with the top open. Pretty much just need to pick a place to add a vent. One idea was to drill holes in all the pac man dots. Would be neat to see it in the dark like that with the onboard led lights. Really 100 ways to solve that problem based on preference.
I went with the board cause it has USB 3.1 Gen 2. Brand new 970 Evo is crazy fast and affordable. Single stick 8GB ram cause I would rather have the option to upgrade to 16GB if its ever needed vs the slight increase in speed from the dual channel. And the power supply is actually the 300W version, Couldn't find it on here, but the price was the same. With tax that whole thing was about 475-480.
Tools used was a dremel with a lock cutting attachment. Standard drill to punch the holes for the 4 screws and 12 nuts. And half a stick of hot glue.
Also have a Pico PSU with a power brick that I could have used. But I decided to save that for a smaller case build. There is plenty of room for the power cord inside the case with the internal power supply. So why waste it.
If I had the right tools and more time I would cut pattern for the motherboard right out of the lunchbox instead of using the faceplate. I put the faceplate on the outside to cover the sharp edges left from crappy dremmel work.
Lastly I just used some hot glue around the cuts for the faceplate and power. But it looks like crap. =P Just need to spend some time making it look better. But part of making this cheap, was only using a standard dremel to cut the box.
Oh if anyone is interested I have been using simple machine screwes to mount the board. Long screw with one nut to hold the screw to the case. Second nut screwed down to the height I want the board. 3rd nut to hold the board tight. Works great and costs 50 cents.