I work only with Corian I make more than just pens but I make a lot of pens every year. I use so much Corian that it has turned into a full time job recycling scraps of Corian.
Below is a link to a PDF file that is a general overview of different possibilities, pens, finishes, tools etc. You probably are familiar with all of this already, but since this is in the introductions, I don't want to leave anyone out. This was just completed and still has some minor mistakes that will hopefully corrected in the near future.