dude, killer job. I've followed this thread for long enough to decide I need an ikea wardrobe too! I actually think I got the exact same one (i think its called the aneboda) and plan on building the same carbon filter you added and installed to the cabinet.

how do you have the filter attatched? does the opening fit into the hole you cut? or connect with some kind of air duct? and is that a dehumidifier down inbetween the plants?