Don't know the answer to your question Eddie, but I'm considering the same thing. I've seen pictures of the 17B with the end cabinet removed, and it looks like a nice place to stretch your legs a bit. Of course you would lose that upper storage space but still have the space under the bench. I think I saw a post where their build sheet wording implied that the bench was the same length as the 19 when the wardrobe was removed.
I saw a picture of the extended front bench on
this thread.