Thank you everyone for the kind replies!
OldCoot - Looks great!! That is one of the reasons I didn't do this in the Wardrobe closet as well. I knew the wife would dominate the closet while I live out of my bag in the back of the pickup truck LOL
Mrs Evans - They do actually make Under drawer slides. Most Home improvement stores stock them (lowes, depot etc etc)
You could easily screw these rails onto the existing shelves and just put your new drawers or containers right on top of them.
I mounted my rails with Toggle Bolts. Since the sides of the cabinet is just thin paneling I needed something that would hold pretty strong.
I drilled a large enough hole for the toggle to go through the wall. It also allowed me some flexibility to adjust the rails perfectly before I tightened them down.
If anyone would like more datailed photos please let me know and I would be more than happy to post some
Example of a Toggle Bolt in action...