Cuisinart - PerfecTemp Cordless Electric Kettle - Silver

There is a plastic thermos lining under the metal lid along with a curved plastic shield inside the metal spout to prevent hot water from splashing out of the spout.

Yes it does

There is a bit near the spout inside. It holds a little screen to help filter out any scale that may develop in the kettle bottom. I believe that the see-through column is plastic too. The interior bottom and interior sides are metal, however. I don't think there should be any concerns regarding this small amount of plastic. This product appears to be well-built.

It doesn't need to be emptied unless you specifically want to empty it after each use.

Yes, the Cuisinart kettle carafe sits on a base for heating purposes. The base has the plug.