SueZQ from MN

First off, we all have to work in a space that is comfortable for us whether we are left or right-handed, or have other issues. I am claustrophobic, so I have to have space around me, I am assuming that the opening next to your monitor is a window. Is that correct? If it is, then I would want my sewing machine in that area so I could see outside as I work. I don't know how much time you spend at the comuter, but if it were me, I'd move my computer and monitor to the end to the smaller space where the machine is now so I didn't have to move it or work around things when I want to utilize the larger flat space.
The next suggestions come from my own experience of having a corner desk where I sew, so might make some things more convenient for you. The area on the left end appears to have a nasty corner in the back on the floor that would be hard to access, especially if you have knee or mobility issues like I do. I would suggest having either drawers or roll out shelves put in that end so that the things stored back there would be more easily accessible. They would come to you instead of you having to try to get to them. Like others have mentioned, you need a bank of shallow drawers, and the front right corner would be the logical use of some wasted space, but maybe not the most convenient spot for them.You also need to add a.shallow pull out tray or drawer right under the tabletop wherever you will be using a chair so basic items like scissors and pens and paper are always handy. Lastly, I would have a special narrow vertical storage area for long or oversize rulers and spare cutting mats that you might not use all the time. Also a sheet of pegboard would be nice for smaller rulers and tools. Maybe that could go on the front end of the shelf wall.
A cuple of random thoughts. Don't foget to add holes to the tablaetop to run cords thru to the outlets. However many outlets you think you need, multiply by 2 or 3!!! Make the tabletop a height you are comfortable working at or that works with your sewing machine. Since you are having this made, customize it to you. Lastly install adjustable shelves that are closer together so that items are easier to get on and off of the shelves, especially those in the back corner,
Thank you for allowing me to "build" a dream work station at your expense. haha We would all love to be able to do what you are doing and spend the money to get evertyjing "just right for me". Good luck.