This is my home photoshopped into the lot. I added flower planters to give it a homier feel.
Here is the full overview of my final design. I chose wood textured floors throughout most of the house and tile for the bathrooms since that's what most people prefer. I used gray brick on the outside of house because the color pops but the material still blends in with the surrounding homes. The guard rail for the roof is made from metal panels. Lastly, I chose to use turf for the roof floor to give it a comfortable texture. Overall, I believe my design fits my goals of affordability, comfortability, sustainability, creativity and it's also very pleasing to the eye.
This view shows the staircase and kitchen/dining area of the house.