Studio Progress

I mentioned a couple of weeks ago that we are building a writing studio out back...on a $300 budget. Progress is being made. My Tall Drink of Water is working tirelessly (and sometimes tiredly) on it every chance he gets.
We are still within budget...and finally almost done with the outside walls~ moving our thoughts and work inside to put the insulation, walls, and electrical in place. Of course, my thoughts are drifting to the decor. I continue find inspiration on Pinterest and you can follow me on that train of thought here.
The studio is being built with reclaimed oak horse farm boards. Great in theory...but much more labor intensive to straighten and nail such old, weathered wood.

Paint chips...what color should the exterior be?
The old door~ purchased for $10. I love it so.