I would say 4th street would be the natural alignment, but then the issue is getting over The Core, which at 4 storeys plus the domed roof, isn’t really feasible I guess. I always thought 11th and 2nd alignment was underbuilt though. 12 Ave and 5th Street tunnel would have been better. Get the people to where people go, easier. Employment Centre, population centre, mall, medical centre, etc. plus there’s both an eastbound and westbound station adjoining at 5th street. A station at Central Memorial Park on 12th, then turn up 5th building the turn under the Chumir parking lot. Even having the terminus at 5th and 7th.
Even 3rd would be better, since the plan already is to rebuild 3rd eventually anyways. Would make a good single lane one-way.
And that’s the end of my fantasy 10 billion dollar diatribe.