Well I did my own see through CE2 mod. Didn't want to use my only syringe and I dont care for the homemade look of clear plastic on my EGO so I used the body of a blue pen. It works flawlessly save for 1 problem, the inner diameter of the pen body is just slightly smaller than that of the stock tube. So the o-ring with the 2 holes in it wont fit around the ceramic cup... Instead I put an extra middle o-ring in, it seals it pretty good but I'm sure if I were to hold it upside down too long there would be a mess. This will be my at home rig, I'll be on the lookout for some good plastic piping of the proper inner diameter to make myself some travel cartos. Also I was unable to make it so that the cone fits, its unlikely that it would be easy to get it to fit since any plastic piping is going to be far thicker than the stock metal sleeve.
I don't know how to put pictures up, if someone could tell me I'll post some up.