Scott could you explain how you made the pen in a little more detail I think I would like to give this a try. and how did you finish the top with it cut on an angle like that?
There is a lot of great info on the site about closed end pens so I wont get into that part of it. A search for "closed end" or "pin chuck" will keep you busy for hours!
What I did for the cap (bell shaped end) was start with 1.5" square stock about 3.25" long. Drilled and tubed it as you would for a closed cap Baron. Next, drill 2 - 1" diameter holes at 90 deg to each other. Be sure to leave about 1/4" between the bottom of the tube and the 1" holes. Mount it on a pin chuck and turn the shape you want and rough sand it. Take it off the lathe and make a cut (I used a bandsaw) across the center line of the 2 - 1" holes. Now you have the cap. Put it back on the lathe and finish. The four points it sits on are never level so sit it on sandpaper and rub it back and forth until it sits level on all four points. Hand sanding and finishing required for some areas.
For the body of the pen I started with a .75" square by 4" long blank. Drill and tube as you would for a closed end Baron. Turn your shape and rough sand it. Take it off the lathe and make the angled cut. Sand as needed to remove chip-out and cut-marks from the angled cut. Put it back on the lathe and finish.
Thats a real rough idea of how it's done. I just figured it out as I went.