As far as inlay material, the sky is the limit. I have used brass, copper, aluminum, acrylics of all sizes. Never used paper but others have so try it. Used wood veneers that I mill myself. If gluing wood to wood I use Titebond II. If gluing other materials I use epoxy. On the rare occassion I will use CA. But what i will tell you always roughen the material up to give it some tooth and it will adhere better. If I use CA it is always med grade and I will coat both sides and then add even more. Your pen looks well done. You have a feel for segmenting so keep driving.