Great videos.
It's obvious that you're new to making this type of production as the nerves clearly show but there's little that can be done other than continue to make them and soon enough you'll find your comfort.
The only criticism that I'd make is when you filmed your test, specifically the fog tests of the 10 120mm fans. The lack of audio was deafening. Perhaps I could suggest that for the future you could find some complimentary background music, just to play during such tests to keep viewer focus.
There is one more thing, but it's more of a personal peeve of mine than a criticism, the majority of online video reviewers do it also. The visible mic cable. One of the design functions of a lapel mic is so that the cable can be fed under clothing and hidden discreetly (the cable not the mic)