Thanks Barbara!
I really enjoy making these. The simplest ones take me about 15 minutes and the most intricate can take about 2 hours. It's nice that within 2 hours tops I can hold the fruit of my labor in my hand and enjoy it.
I've also had a lot of my friends and neighbors over to make their own pens. The simple kits are easy to make with no experience and a little guidance - and everyone leaves my garage with a pen they made themselves!
My next step is "exotic" materials. They actually sell Wooly Mammoth ivory pieces to make into pens, over 10,000 years old!