Hi Jon,
Sorry for the delay getting back to you.
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We have less concern about the exact format and location of timestamp. It is most important that the timestamp is present in a way that your users will most clearly understand and that it is linked to the Tweet permalink page for the Tweet.
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We require that, regardless of source, you do not commingle non-Twitter content with Tweets.
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Same as above.
In the case of notifications – if you’re displaying any part of or contents of a Tweet, then you’ll need to display it according to display requirements. If you’re just displaying a notification of the fact of a tweet existing, I would recommend avoiding rendering the tweet content itself and just indicating that there are pending tweets by @suchandsuch or an equivalent that works for your scenario.