http://www.drlnow.ca/costanalysis.html
Look under the heading:
track costs.
Jupiter,
Colour me impressed. I appreciate the level of detail you've put into producing this.
Make sure to alert the media with your findings. My only qualms with your proposal with that your spacing gaps are a tad too wide in some spots, and while adhering to the rail corridor alignment as much as possible may save on construction costs, such an alignment is quite a way aways from denser parts of the downtown core. Even through the St Lawrence neighbourhood I see you use Esplanade going across, however using Front St E as the right-of-way would bring the line within a block's distance of the King St Corridor (and certainly exits could affront there) and still be a few minutes walk for all area residents to the south. I would also recommend a fusion of your Queen and CNR proposals when navigating the west end. Parkdale, Swansea and Roncesvalles Village would be inadequately served via running up the Weston-Galt west of Gladstone Stn. Having the tracks turn west along Queen Street would target a very dense area of Parkdale around Jameson Ave, a five minutes walk north of a large mid-rise residential apartment community and a more opportune connection point with the 47 bus than at MacDonell.
One final recomendation would be to consider running the leg to the airport west along Eglinton til about Kipling or Martin Grove before running up to Dixon level. The area between Scarlett Rd and Royal York Rd along Eglinton has high-density residency on a scale equal to the Kipling-Dixon neighbourhood and I think stopping for both Royal York and Scarlett is important from a walk-in standpoint. If transitioning northwest at Martin Grove all that's needed to route the subway in a trench through the hydro-corridor. At Kipling, it is also possible to veer the line NW thorough the Richview corridor, Stone House and West Grove parklands. This may require some minor expropriation but could result in the existence of a Martin Grove-Westway Stn where 3 routes could converge (46, 52, 111). The way I see it, Weston doesn't need a subway connection in the immediate future with several commuter-rail options at its disposal and it being a short ride of the DRL (via Eglinton) on buses heading either south, southwest or west.
Doing the alignment like this allows for the possibility of interlined trips to/from the airport: one heading to/from the downtown core, and the other east along Eglinton through Midtown to Scarborough Centre. This would allow citizens from anywhere in the city to have fast, direct access to the airport area, justifying the need to expand mass transit right across Eglinton Avenue using subway technology for ease of travel and cost-sharing of vehicles, storage yards and facilities. Anyhow best of luck. The more proposals like your's we have ruminanting in the public consciousness, the better.