Q.Boston ivy
I’m just in the preparation stages of building a hobbit home, basically it’s a dome shaped dwelling made of similar materials to plastic. It is built and then generally covered with grass. I’m curious if anyone knows if I could cover the structure with ivy like Boston ivy, so I guess the question is will Boston ivy crawl up and over a dome or will it need a trellis or some other thing to accomplish the desired coverage? Any help is much appreciated.

Thin wire can be used to form a trellis for the climbing plants to start on.
https://www.gardeningknowhow.com/ornamental/vines/ovgen/growing-plant-cover-fence.htm
https://www.gardeningknowhow.com/ornamental/vines/ovgen/vines-in-the-landscape.htm