Sandygirl, I don't have your problem and the amount of slant you have is not completely clear, but have you considered hanging your shelves down from the slant ceiling on chains, or for fabric storage, you could hang metal clothes rods from chains, maybe even two rungs long, and use regular hangers or pants hangers to hang fabric pieces, rolls of batting etc. I don't think I would do it the entire room or it may end up feeling like a bowling alley (unless your room is quite wide).