Hi Russell,
Have you looked at this jazz.net article? It has some information about migrating from RRDI to Insight, although I don't think at the level of detail you're looking for. https://jazz.net/library/article/1153
To the best of my knowledge...
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The outage will take only as long as the upgrade takes - I don't believe there is any additional time for migration, as you already have the CLM data in your RRDI warehouse. It would take extra time if you were going to add any non-CLM data via other ETL's, but that wouldn't be an "outage" in the usual sense.
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You can use the CLM data model with Insight, so if you do that all RRDI reports will work just fine
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I'm not sure about the BIRT... hopefully someone else can jump in here.
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There shouldn't be any impacts on queries or dashboards
Also note this is an article about upgrading to Insight 1.1.1.1, but I don't see a corresponding 1.1.1.2 article so hopefully most of it should apply equally.