Hi, Im wondering, can a ESP file have more than one BSA file? I'm wondering as I have a Merged project with over 6GB of data. And since I can't compress anything but the textures, I need multiple files.

Supposedly. Skyrim uses multiple BSAs and I've been told many times that it can be done. That said, I've never gotten it to work. Maybe someone can point you in the right direction. I'd be curious to hear if you get it working.