Earth Bag Root Cellar

I have a great location to dig out a root cellar in the side of a North Facing slope. Has anyone built a root cellar into the side of a hill using earth bags? I have seen a few images on the net that look pretty promising.

http://www.naturalbuildingblog.com/the-pantryroot-cellar/

http://omelays.blogspot.com/2007/03/spring-is-here.html

Nettie

I built one into a berm from an old irrigation ditch, digging in and down about 4-5 ft. deep. 8X10 interior dimensions, earthbag walls and a flat frame roof of 4x4's and 3/4" T&G plywood. The top was covered over with a few inches of dirt and some strawbales placed on top. It basically looks like a big mound of dirt with a slanted doorway on the front. I live in a very dry and very cold climate. Exterior walls are sheeted in 6mil plastic and 3"-4" poly iso insulation board I managed to get cheaply. The cellar has been great through the last 4 winters now.