built this as a fun project out of spare parts in the garage, made it basically for portability.
yes, it is in a backpack..
everything worked out pretty good, cut out holes in a cardboard box, threw everything in, put the PSU into the backpack connected everything, cut holes in the backpack (shh! dont tell my mom! XD), finished it the next day and booted perfectly on first try! (besides the on button having some issues)
airflow is surprisingly good! i thought it would be much worse, it doesnt get too hot.
only problem is weight, the computer itself isnt that bad, but the monitor.... whew!