I have been working on an updated roller ball pen design and think the result is pleasing. The pen below was originally designed of Schmidt roller ball cartridges, but I can modify it to use Pelican and Gel cartridges if you are interested.
The pen is made from a three color Alumilite casting by Bob Dupras. It is 126mm (4 14/16") long and 14.8mm (19/32") in diameter. It is a flush sided pen. The pen price is $195 plus shipping. Contact me at firstname.lastname@example.org if you are interested.