This game scratches an itch that I can't find elsewhere. I really like growing a collection and organizing it, especially with fossils. I noticed some things you will need to fix and have some ideas about where you can take the game in the future.
For the most recent update:
Errors:
Diplodocus is too long for the current rooms; I had to rear it on its hind legs to keep the tail from clipping. Maybe make the hall longer than the wings of the manor.
When you are in the museum, you can sometimes open menus on top of menus.
Also, "trilobites" is misspelled on it's fact sheet.
Ideas:
It's be cool if you could rotate bones left and right as well as up and down so you could give the skeletons cool poses, though you would probably have to break them up into smaller pieces to make that work.
Sometimes museums will display a skull or a single bone (like a femur) on its own. It'd be nice if you could make smaller mounts for such bones that wouldn't get a thumbs down from the visitors but still less draw than the skeletons.
Having expansions to the left of the hall as well as the right would be more "museum like", as that is the layout most museums have.
As you add more fossils, it would be nice to differentiate dig sites by era in each location, i.e. only Jurassic fossils in a dig site.
I think the game should start out at a smaller scale. Maybe you have a truck instead of a plane and can only look for small fossils in the local gravel pits. A single bone, an ammonite, shells, and so on. Then you can raise funds to go to the famous dig sites with skeletons.
All in all, I'm really enjoying making a little museum in this game and look forward to what you have in store for the future!