What I liked about Arzi's H B was not the actual bass, but the idea that a 4001/3 could be "chambered and an "F" hole installed. I would be prepared to ask if this idea could be made in the factory on special order.
The other thing which needs to be mentioned was the fact that the H B has taken a fender "F" hole and stuck it on a 4001/3! Not the best mix!