About 10 years ago I built a cart very similar to the one in the link below. I have it to the left of my saw with the full/ half sheet storage side facing the saw. I have the bins in the center full of everything from dowels to saw track, jigs and shorts - bins on the opposite side have smaller plywood pieces. I haven't looked at the detailed plans on this website but one thing I recommend is using big casters and screwing/gluing oak or similar strongbacks/stringers along the bottom to prevent sag.
Rolling lumber cart
