When I work on a large quilt that will take time, I assemble the components to make several blocks (say 1/4th the quilt) and place them in plastic dishpans. I have four that I use as temporary storage. They stack into each other so the fabric pieces stay neat. I assemble the blocks 1/4 at a time also, just in case I decide not to make a large quilt. I don't assemble the full quilt till I have all the blocks made, so if I run out of any fabric, I can mix it in one of the batches and around the quilt.