Thanks all. Unfortunately, I don't have a table saw, so ripping the 2 x 8s to 7" might be fun. All I have is a radial arm saw and a circular saw. Will Home Depot / Lowes, etc. do this for you?
The door width to the edge of the brickmould is about 36". I don't really want the top step to be 3' deep... 2' would be more than deep enough. Also, if I wanted the left side to be a straight drop instead of a step, I assume I would make the boxes 11" x 11" delta between each step? The door height from the garage floor is about 21 3/4". so I guess 2 steps should do it?
Thanks again,
Chris