Scrap the idea of Dublin and stay in the UK.
Why have you selected Oban/Islands and Inverness? What are your expectations of both and what are you hoping to do/see while there?
As already pointed out, November isn't the best times. I'd be inclined to concentrate on the Glasgow/Edinburgh area. There is lots to see and public transport is good. The two cities are very different.
Some ideas - and there are plenty more if you start to research the places....
Glasgow - Macintosh connections (don't miss the Willow Tea Rooms or the Macintosh collection in the Hunterian) St Mungo's Cathedral and Necropolis, Kelvingrove Museum, People's Palace, Fabulous Transport Museum. Take the train to Helensburgh for the Hill House (one of the best examples of Macintosh's work). Weather permitting, take the train to Ardrossan and the ferry across to Aran.
Edinburgh - Castle, Holyrood Palace, Royal Mile, Georgian New Town, Walk up Arthur's seat, Botanic Gardens, Zoo, Royal Yacht Britannia. Get the bus to Rosslyn Chapel. Catch the train and then bus to St Andrews (or bus from Edinburgh) a university town with ruined castle and cathedral. Catch the train to Dundee (V&A have a museum there, Verdant works is one of the best industrial museums, visit Discovery, the ship that took Scott to the Antarctic...) Catch the train to Linlithgow and visit the ruined Linlithgow Palace and birthplace of Mary Queen of Scots.
Visit Stirling - doable by train from either Glasgow or Scotland, with its castle.