All this sounds like quite the project, especially doing most of the construction work yourself! It's cool to hear how much progress you've made, from painting the shooting floor to tackling those "100,000 +/- loose ends." If you run into any sealing or waterproofing issues, flex seal customer service could be super handy. They've got a bunch of products that might just make your life a bit easier. Looking forward to seeing your studio when it's all finished!