You have some plastic bins there. Get a hollow core door, paint it white or whatever color, and have your hubby or dyi cut some sides as legs. This way the bins can slide under the door "counter top" and you have another top to work with, maybe make it an ironing surface or a cutting surface. Of course, if you have a nice table, build a shelf in underneath and slide your bins on it. Or if you have rolling bins, fit them in under. Between the windows, find a bookshelf that fits and you have another area to fill. If you make the tables to fit under the windows, perhaps you can fill that whole wall. Use that cheap NBF or whatever it is called at Home Depot and use that as legs.
I would place another bookshelf on the back side of your sewing table, lay it down and put little legs underneath to bring it up to the height of the sewing table. Cover bricks with fabric or even old maps for legs. I have my fabric in bins and I am not 5' tall so I am going to redo mine too. I would keep the color of the furniture alike so as not to detract from the quilts you will be hanging. And use that top shelf of the closet to keep your batting on.
Good luck, and keep busy. You will get it done, I know you will!