Welcome to the Quilting Board!
Instead of just windows how about a skylight over your sewing area?
I would put a countertop all along the 1/2 wall with one section low enough for the sewing machine. Than put cabinets underneath with drawers and doors. I don't know how tall you are but this would be for me (5.5 tall) about the right height for cutting and working. Or instead of cabinets use roll out bins and drawers for ease of finding stuff. Use clear storage that you can see thru.
WOW, my kids and family think I have too much yardage, but wow, you are loaded, I am so envious of the amount of space you have, good going, you can quilt through all those storms on the east coast for days without having to leave your house
happy to have enough stash fabric at all time
I once had a sewing space very near to what you are describing. There are times I still think it was the most efficient space I ever had! LOL I had quilts hung over the railing to block the view and had rolling storage around the staircase. That way I could roll a cabinet over to the workspace which let me utilize it as extra workspace (this was my ironing board) and quicker access to fabric, thread, etc.. Mounted on my partial wall I made a storage out of fabric that held my pins, scissors, etc. I had two outlets that were right above the table top so it was easy to plug in machine, iron, etc.. I wish I still had those, LOL. The older I get the less I like the crawl under the table task. I had cabinets that my DH made that was part of the frame (the ends) to the workspace for storage. Then he made me a roll under the workspace cabinet for more storage. We had high ceilings in this room so he made me a shelf that pulled up and down toward the ceiling where I could store things that were seldom needed. Kind of like those garage shelves they sell for the top of the garage. We were so squished in that little house with both of us and three kids and a couple of dogs, but it sure was a warm and loving home and remembered with fond memories.
I've seen tables that slide out at a right angle from a desk, or workspace, to create twice as much table area. That looks interesting.
However it turns out, and you do have some outstanding ideas, it will be YOUR space and that is what counts! Enjoy every square inch of it!
you can look at hanging wire cubes or garage storage units from the you can get these types of things at home depot or lowes
I have a small sewing space too and one of the best organizing tools is a pegboard. I have two pegboards and I hang all my tools on it. I don't just use hooks, I also hang small wire baskets to store larger things. The boards keep my tables clear and but keep my tools near. Here is a link to post that I did about my sewing room: