Hi, Not been on the forum for a little while (sorry) - Just catching up!! Re. extra HD - yes it could be done, but you would need to sacrifice the fan in my configuration. For second SSD probably okay, but for a second mechanical HD I think it would cause a bit of heat. This is why I went for on board mSATA plus a single mechanical drive as a fusion set up. You can get 2.5" drives now up to 2TB so not really much need for putting an extra one into the Mini case. Just wanted to mention that nothing in this build comes from Taoboa!!!!