First of, I searched, but did not find what I was looking for.
Second, sorry if this is a nooby question, but I still couldn't figure it out...

Ok, I drew the shape of a robotic foot similar to that of a walker in StarWars in the side view with EP curves tool. But how would I make this a 3d shape?
I tried duplicating it and lofting, But it did not work. And if possible, can you make this one object (so it is like a primitive. You click somewhere on it, and it selects the whole object)?

Please help me out!
(and thanks in advance!)