Superb start and great first effort.
Watch out with the plastic display boxes you have the slimline in, the center clip on those boxes can mark the pen sides.
The blue slimline looks goo, it looks like the tubes just showing through on the ends of the pen, to prevent this then colour/pain the inside of the blank after the hole has been drilled. that way you wont see the glue or the tube. Some just pain the tube, but then risk seeing the glue under the blank after its turned.
Hope that helps.
Keep them coming.