Rolling Shelf Plans ? -

On the podcast, I hear about the rolling book shelves.  

Where are the plans?     Please share the link.  

Then about four years ago I visited a community and they had a large shop/garage space and I suggested that they make shelves that reach the ceiling and have wheels, so the room can transform into a woodshop, kids playspace, classroom, art studio, etc. And then last year I saw that they implemented my suggestion. Very nice.

So this year we made three shelves 12 feet tall and on casters.

You can see some of them here:

The shelves are 12 feet tall, 8 feet wide and 4 feet deep. One person can move them if the floor is clean.

https://permies.com/t/29133/rolling-shelves

There might be plans though a search did not turn up any.