I was just thinking of going with the concrete blocks due to the cost of lumber (and the fact that it burns;-() when I read your post. I think I'll try that route! I actually have a stash of blocks for about three boxes sitting over on the side that the contractors left behind. I was angry at first that they didn't take all of their materials with them, then decided that I might find some use for them
I'm sure it was accidental that they left them behind, but I figure it's been a year...sooo....