Sounds like something like removing the Windows on your slide and perhaps installing a "light weight" RV Sliding door. Same sliding door they install on "mobile park" RV trailers. Or, perhaps installing 2 x large swing out doors - that some have on their Toy Hauler sides. Or, a combo upgrade of each????
If you take a few pictures of your TT's outer slide and take the pictures to a few of your local welding shops, I wonder if they can give you some ideas. For example, remoing your slide's factory windows and replace with something different. Might be worth asking them for a few good ideas....