@CrixD: They're just aluminum angle pieces joined together. I can take some measurements, but with only a steel ruler I don't know if they will be accurate enough for you.

@Roodbaard: Thanks, it's the modding equivalent of kit-bashing, which is great, because I have neither the tools nor the expertise to fab my own parts.

@Shocker: It's possible, but depends on how you want to step-down 140mm to 120mm. Biggest issue is the top panel is very close to the mobo, so tall mosfet sinks or blocks will interfere with a top rad. You might be able to get away with a scythe 140mm kama: Mount to the case using 140mm holes, and mount to the rad using 120mm holes.