I've gone the TrueNAS route, but I'm running it on a QNAP TS-451. I'm running TrueNAS off of a USB stick hanging off the back, so I didn't have do to anything with the hardware and reverting back to QTS is just a matter of setting the boot order in the BIOS.

I really like seeing other people's builds, but I know that building my own computer isn't something I want to do. I was happy to see the comparison between the DIY model and the roughly-equivalent commercial units. I'll likely buy another QNAP (to run TrueNAS on) when the time comes, and the comparison tells me that I won't get screwed too badly by doing so.