If you are looking for a simple studio design, you might consider Tuff Sheds. They are now affiliated with Home Depot and you are not restricted to what you see on the lot.
You can contact the Tuff Shed dealer nearest to you. Modify one of their designs, add windows, change doors, choose your shingles and colors.
The design is then purchased through Home Depot which offers a variety of financing plans.
Here is a shed that can be easily modified to suite your needs....buy a shell and finish it yourself.