Thanks for the heads up! Just pushed a fix.
In regard to the build command:
You'll need to find a blueprint for an item, let's say a drill, then type "build drill".
It will list the required parts, and indicate which ones you have. If you are good to go it will ask you if you are sure you want to build that item using the tool you have equipped. If you confirm, you will attempt the build. If you have enough skill you will likely succeed.
Dismantling things, as well as building things, will boost your assembly skill.
Thanks for trying it out!