Diego, I'm impressed both by your resourcefulness and the bass' look. I like the upper horn aesthetically and from the standpoint of balance- I'd rather look at an instrument that I know was designed to eliminate neckdive than one which has neckdive*. Form following function can be beautiful sometimes.
I love two-piece bridges to death, but only when both pieces are made of the same material. I'd love to see this bass with a two-piece brass bridge like Alembic or ETS, or an all-wooden one with a piezo saddle.
* Except Alembic. They get a lifetime free pass on neck dive because of their quality.