eliteHW has posted a modding article on stealth-ing your CDROM drives. This mod isn't just restricted to Lian Li cases either.

Due to popular demand, eliteHW has started on a sequence of articles involving simple case mods. Hopefully these guides will show you how to improve the aesthetics of your case without huge costs. The first in this series of articles will be on stealth-ing your CD-ROM bays. This mod is not all that original or new, but I post in several forums, and when people see my rig I get a lot of "Whoa, how'd you do that?" or, "Then how does the drive open?" Hopefully I will answer these questions with a simple guide.