This is the original blog with instructions, she says how to make a shelf inside the hole to put things on http://diy-vintage-chic.blogspot.com/2012/05/vintage-wine-crate-coffee-table.html
Dh and I made this today. We did not put it on casters because I did not want my little one rolling it around, so dh just built an extra base for it to give it some height. We are also adding the little shelf in the middle to have a spot to hold the remotes (which will finally get them off the mantle!). I am going to tea stain it tomorrow and wait to seal it until I decide if I want to stain it further, my living room has a mix of medium dark and light wood, so I'm not sure, the tea stain may be the perfect in between.
I bought the crates at Michaels for $10 each and we used wood and hardware we have already. I'll post a picture once we finish it :)