I would also recommend building a clock then you can leave behind something that is also useful and beautiful, but I would avoid weight driven clocks unless you have a talent for woodwork. A spring driven clock can be placed anywhere and can be covered by a easily bought glass dome.
For a first clock before you build a family heirloom I would suggest the following
"Building an American Clock Movement by Steven G. Conover"
It was written quite recently so does not expect you build everything on lathe and includes a clock wheel making jig as a bonus.