It is 18' x 21' it will hold 18+ cord if you fill it all the way. I did that last year and will not go that way again I am going to stack my wood across the end 6'W x 18'L x 6.5'H and down the sides 4'W x 15'L x 6.5'H and leave room for my tractor in the center. I am thinking around 10 cord.
Yes, great question. I'm told to make them like the pole building guys do. Bury in first with a concrete block on the bottom, under Frost line depth.