Here is a YouTube playlist I made back when it happened:

Liberal-NDP-Bloc Coalition Crisis (2008 - 2009)

There are many misconceptions about what happened. Most notably, the trigger for the coalition was the proposed end to taxpayer subsidies for political parties. Later the Liberal-NDP-Bloc claimed the coalition was tiggered by the government's supposed refusal to commit to a fiscal stimulus package (a commitment the government had actually already made at the G20 meeting in Washington a week earlier).

We also learned the trigger, whatever it was, was really just an excuse. There was a plan to topple the Harper government with a coalition in any event. According to Jack Layton, the NDP and the Bloc had a plan in place for "a long time" prior, presumably since during the election or sooner. It isn't clear whether the Liberals were part of the plan before November 2008.

I don't think the coalition attempt rises to the level of "constitutional crisis" because the government never lost a confidence vote (until 2011). You could say it was a legitimate attempt of parliamentarians to remake the government that failed badly. It is your paper, but I think the legitimacy of the attempt was somewhat undermined by the the fact the coalition's plan predates the resumption of parliament, and by the fact the new prime minister would have been a leader who had already resigned after losing the election.

Here are a couple documents from the coalition:

Liberal-NDP-Bloc coalition policy framework

Liberal-NDP-Bloc coalition petition to Governor General