"The "people" of Scotland do not want to get rid of Trident" - actually the evidence from polls is that more of them would like to get rid of it than would wish to continue having it. That might not be the case in the immediate vicinity of Faslane, since there are worries it could cost them jobs and trade - though even that is by no means certain.

And the promise that a vote for independence means getting rid of Trident is a significant element in the YES campaign. It's seen as a definite vote winner.

As for Shetland and the Orkneys, I'd think it likely that a constitutional arrangement similat to that of the Faroes with Denmark would be likely in an independeny Scotland.

If I was a Scot I think I'd be very sceptical about all the talk about how a No vote would be followed by increased devolution. The same kind of stuff was promised when they had the first referendum in 1979, and it didn't happen.