Here are some more of the components on how this particular device was made.  Jack Scholze is usually pretty cool about sharing how he makes these things as well as getting back to comments on the videos:

I used IPG Aluminum foil tape with adhesive backing for the disk sectors and for the capacitors which are traditionally called Leyden jars. Curious thing about Wimshurst is the max spark is determined by the area, diameter of the plates and disks, and not be the rpm, so spinning it faster gives more sparks per minute, of the the sam length. If you make the gap too large, it doesn’t spark at all, or it sparks somewhere else you don’t expect. Of course the rpms is proportional to the amount of energy in joules traversing the system.

What do you think is there something to this thing?  Aside from the cool factor could this be built out into large applications to save energy?  Feel free to comment with your ideas.