It is agreat record, I agree. Should've been a bigger hit imo. But I wonder how they would have performed it on stage. It seems even harder than "Good Vibrations".
Wonderful video! I hope you won't run out of ideas

I understand what you're saying in terms of the 1966 time frame, but clearly Brian and his band figured out how to do it quite successfully some years later. I think if Carl had put his mind to it (of which there is no evidence that such ever happened way back when) he probably could have figured it out. Though he'd have needed to schlep (or rent) an organ around in those pre-synth days.
Amazing, though, how a song that made it to #20 could just disappear from view. It
was included on one of the Pickwick LPs in the early 70s, with the usual strange assortment of time periods and styles. That was where I first ran across it, recognizing after a few listens that it was not too many notches down from GV (which was also on that disk).