Having an Oak pipe is splendid...BUT! If we look at the assumed time period, a clay pipe makes sense as well. They would not be especially difficult to craft, but they would break fairly quickly. Being an RL pipe smoker, the idea of pulling a draught through an oak bowl and stem makes me queasy.
Say 2 bags of sand for the casting mold, 2 lumps of clay for the pour, and (God help me, I am shooting my own foot) sandpaper to smooth the finished product. The unfinished pipe would have a chance of breaking during the sanding, of course. If you want to go with realism, after 10 uses, it would need to be placed in the fire for cleaning. (Yes, that's how you clean a clay pipe!) But again, they could break.
Just a thought.