I'm sceptical. I first read of such plans as a little kid - in old magazines. There was a serious project in Germany attempting to build one, the CargoLifter. It foundered after spending €300 million(!) on the issue of stabilising the craft against wind during loading/unloading. All that remains of the project is a giant hall near Berlin, featured as backdrop in many commercials and films (check on German Wikipedia).

_{*Lunatic*, n.
One whose delusions are out of fashion.}

The artist's impression shows them being used apparently for logging in remote areas.

Progress, we tell you!

With a forty ton lift weight, it could lift one offshore blade.  The lightest offshore nacelle, without rotor attached, is about 160 tons.  Heavy ranges above 240 tons.

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin