In 1990 I built an SE/30 from spare parts, used an 800K fujitsu rather than a 1.2 superdrive, an Ehman grayscale page-sized monitor (remember those) all in an AT tower using a PC power supply, wired to the logic board using the Addison-Wesley wiring diagrams; I could never cover it because the Ehman card exceeded the tower dimensions, and it powered up the moment I pressed the AT's switch.
When I brought in a polaroid of the unit to that early TekServe spot on 18th street, David made a sign around it and wrote, "Why pay full price? SE/30s can be made for $1500 all-in!"