Currently in the building stages, some basic ideas are below:

Ideas:

• Basic House above ground.
  
• Extends downwards via stairs.
  
• Below ground is living space.
  
• Themed around a Soviet missile silo.
  
• Extends very far down.
  
• Possible air strip outside.
  

Some ideas I've had for lighting use is to have a daylight sensor on the end of the air strip which activates a bunch of redstone torches when it's night-time to simulate night lighting as well as a similar set up in the above ground house.

UPDATE TO LIGHTING
- I've decided to utilise a NOT gate with a daylight sensor to work the lighting.

Please feel free to submit ideas and I'll update it every so often as well as the change log to keep people in the loop,

Additional Notes