Well, I just now saw this. Hm. It would be nice to have, but if we’re not getting it any time soon, we’ll have to look in another direction. 
Though, I have to say, the mod system needs to change. Badly. Anything beyond a shoulder strap turns your weapon info into a novella. Reading books in game takes less time than reading heavily modded weaponry in real life.
I do think that modular storage would work without a paper doll UI, however clunky it may end up being.