In Jungian dream work, every character in a dream represents some aspect of the dreamer. Even though you're a fan of Shatner-the-star, do you know anything about him as a person that you identify with?
I wouldn't worry too much about the bizarre aspect of dreams. That's offen the result of meds, even vitamins or other supplements--even food.
Buildings are also the dreamer, specifically the body. Top floor the brain, etc. if house is falling down, that's not good.
Essentially, everything in dreams IS the dreamer, represented in various ways.

The secret to understanding our dreams (according to Jung) is learning our individual dream vocabulary. Keys, a purse, shoes--these don't mean the same thing to everyone, so forget those dream dictionaries. Write down your dreams (the post is great) and study it. Compare, review weekly. You'll learn over time.