For the first yes you can but it just shouldn't be emphasized in the project. A few sentences if needed with the bulk of the write up being the single attraction.Two questions:
1) can we build a (very small) miniland around the attraction. Like not too much more than facade and a gift shop, but along a new path expansion
2) how much wood could a wood chuck chuck if a wood chuck could chuck wood? Asking for a friend.
For the second im assuming that's asking how much does this cost? Thats up to everyone, look to past attractions in your time period, make an estimate yourself (and justify it) and you should be good