Looks great Bob - mine is very similar and I do have some heavy duty wheels with ball bearings. It's heavy, but I can move it.
BTW, very unfair to have such uniform size lumber stacked in there so neatly. Wait a year and when you're trying to fit a hundred boards of all different sizes and species go back and look at your pictures. If you're anything like me it will bring a tear to your eye and a wish for the good old days.
“We all die. The goal isn't to live forever; the goal is to create something that will.” - Chuck Palahniuk