Timothy,
You are receiving excellent considerations and advice for you studio and I would only add that you may wish to consider options to eliminate all outside light in the event that you may wish at times to use artificial light for daytime and evening work. I say this because I found that even north light varies throughout the day and season to season (not to mention snow and dark rainy days). You may also want to have a mirrored wall behind you to check your work/subject in reverse and to allow sitters to watch your progress. Don't forget storage (verticle and flat) for canvas, paper, paints and brushes.
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