Jason and Bob,
The pen goes together well, but the tubes are of such disparate size that I have had problems with them. The upper tube is 37/64 while the lower is 11/32. This leaves the cap material very thin while the body is extra thick (the thickest of any pen I've worked with). If you use acrylics that are partially transparent, the cap will look noticeably different from the body. The only way around this is to paint the inside of the blanks with just the right color. If your paint isn't just right, you're going to have issues.
For this pen I picked a deep royal blue and that seemed to work very well. but using a silver (for example) that I might use on other pen styles to "perk up" a blank, results in a mismatch.
It's not a huge problem, but, remember that I'm still pretty new at this and I have had to learn this one from my mistakes.
Add to this the fact that I see the pen, with it's Hawaiian theme, as a little more novelty oriented than the direction I wish to pursue and you have your answer.