Lid prop is made out of an old 3/8" combination wrench.
Snap-On Crate
The box started it's life as a Snap-On promotional deal that came with some branded schwag in it. Of course my brain immediately jumped to "I'd bet that I could stick a computer in that"...so I did. The feet are 5/8" Snap-On impact sockets and the lid prop is a 3/8" Snap-On combination wrench.
I'll answer a couple questions up front that I've been asked a few times times. -Temps are fine. The Noctua in the bottom is an intake and between the PSU and vents in the I/O panel, there's more than enough ventilation to keep temps I check. An extended stress test of 45 minutes or so had temps settle in right at about 60c. -The hardware was chosen specifically with sale of this in mind. The fact of the matter is that most people who would be interested in it probably won't want or need a gaming PC - the specs reflect that matter.