Wow, this is something really awesome. Yes, it's really cool, and I love that you want to make the house even more in harmony with nature. I think you should look into doors with natural coatings that fit better in projects like this. Such doors will look beautiful against the green facade and will not suffer from external influences. If you're interested, I know where you can find great options for exterior doors mississauga, have a look here https://www.elegantentrydoors.ca/mississauga/. They definitely have models that would be perfect for projects like this.