One other option for holding the batting would be to hang it on a rod so you can just roll it out as you need it and not have to lift it on the wonderful workspace you will have. Has anyone suggested a let attached to the wall with an extra table space you can lift up and rest on the 'gate' or leg? This could go under a bank of shelves or, if that wall faces the sun, a section of cupboards with either doors or something else to protect your stash from the sun. I, too am envious of your space and happy for you, of course.