if you read the article that goes along with the picture, the author tells you that he used undermount Blum drawer slides to build this pullout. It is essentially a drawer with a large face, mounted upside down and with holes cut in the horizontal face to hold the bins.

I love Fine Homebuilding

Here is a link that might be useful: Original Fine Homebuilding article

If you look at it, it's a drawer that uses the cabinet door as a drawer front.

You install the drawer with the cutouts, hold the door in position and drill through it into the front of the compost drawer ... attach the handle through both pieces of wood.

He says he built a maple roll out...I think that's what confused me. The Blum item is a mechanism that allows you to push on the door and it pops out.

I'm clearly very inept when it comes to this! I just see good ideas and I want them incorporated. ;)

I love the supervisor in the picture.