HfxTC, like you say, just a fun exercise.
Let's say the City , the Cats and some backers with deep pockets agree that the present location of IWS would be agreeable to all. Why stop at refurbishing a 1950's/70's outdated stadium, let's just build a new one.
The City owns the land and it is already serviced for that type of use. So that does away with any remediation of the soil that will take place at the Rheim site, price yet to be determined. The City wouldn't have to buy up the residential land around the Rheim site, again price as yet unknown. So I guess that would be plusses on the money side.
To facilitate building a brand new stadium, let's go big at around 32,000 seats just for the fun of it, you would have to take over Brian Timmis soccer pitch on the south side, so that is a loss to some of the sporting community. To improve parking, after that is all part of the make believe exercise that lead to an agreement, you would have to buy old Scott Park School and the adjacent arena for what might double the parking at that site. A bonus that way but another loss to sports in the area. Pool would have to stay, it is a city treasure.
The actual construction would have to be done in stages so that the team could remain there playing. Build the new South stands behind the present ones. Tear the old ones down when seasons over and relocate the field southward, not forgetting the track. Erect temporary North stands for the next season alongside the new field. and tear the old ones down. Next off season build the new North Stands. I am sure an actual engineer could figure out the logistics.
Money wise, it might be a "push" for what the total amount at Rheim might have been, maybe a bit less, with bigger stadium and a bit more parking. Either way, I have never seen a major construction job in this city end up costing what was first presented as a total, always seems to go up quite a bit so who could even guess.
Anyway fun to think about. Anybody else have ideas how to make the old site work?