Provide at least one durable style of plating for each pen. I would like to always see chrome or something as durable, and I hope as expensive(cheap) of a finish.
Add more meat in the wood area - by this, more distance between the the brass fittings and the edge. This way we don't have to paint, or colorize the brass tubes, and should reduce breakage for the "plastic" pens. I think this might be good design consideration also for wood pens too. Common tube size is a must - otherwise it becomes hard to square up the blank for turning.
Also, when the pen is sold, good photo's of the full pen, closeup of the tip, and cap, clip, for each plating. I have ended up getting stuck with some - well, lets say - pens that really look bad because I could not tell 100% what the kit looked like.
Less plastic, more metal parts.
Bradbn4 - having fun in Colorado