consider developing a base webpage for those domains and allow them to establish their own visibilty level.
The reason recommend this is because they are a unique narrow market. I believe they have very strong potential for either promoting cabin rentals (directory) or actual cabin kit sales.
I would ballpark the values of these domains without any content at $500-1500.
With content and any sunstantial UV rate, add a zero on the value range, especially if you develop a cabin kit website, that offers kitted wood and plans.
best regards, Bill