The one I have has an external fan already attached ..maybe the best is use a cheap USB to 9V DC-DC boost converter cable. The SSD can be attached to the base using screws (came with mine)I ordered a very similar one from WooYi, seems to be the exact same thing.
Do you know how an external fan could be hooked up to this? I'm not seeing anywhere to power it, unless the power for the SATA drive is split somehow. I was hoping to throw a 120mm Noctua fan on it to keep it cooler.
Mine runs pretty cool right now, idles around 30C, and it didn't seem to have any gaps on the heat sinks either.
Also for the 2.5" SSD, are there brackets to mount these inside? Mine is pretty much just laying on the bottom right now.