The NCC delivered a presentation on the western STO expansion, specifically the crossing and entry into Ottawa. They prefer the Wellington surface option however they also do support the Sparks tunnel. You can find the presentation attached below.
Public Rapid Transit System Linking Gatineau West to Gatineau and Ottawa Downtowns - January 21, 2021 - Board of Directors
A simpler time back then. I would have loved to have experienced the Ottawa Streetcars back in the day. Still hopeful one day they make a return in some form, with 2 or so routes through downtown or the market.