For the most part I followed the instructions in the original thread:
http://boards.cannabis.com/growroom-...on-filter.html

Instead of solid end caps, mine are vents and the screen is tight enough to prevent any leakage of the crystals. The only reason I got those though was because I couldn't find solid caps lol! And the only other thing I did different was put my $2.49 reducer on upside down because there was no inner part for the chicken wire to clamp on to. So flipping it worked just fine. I just used my mini-fan that I already had to sit on top which works just great. I may duct tape it on eventually because it doesn't quite attach to it, but for now it sits on top just fine, its not going to fall off or anything.

As far as getting rid of the smell (which was becoming a problem) all I can say is that this really does work, I'm extremely impressed with this, and the total cost:

Reducer $2.49
4" Clamps $2.39
3" Clamps $2.39
4" vent cap (about $3.00)
3" vent cap (same)
Pantyhose $2.39
1 Foot of Chicken Wire cut from a roll (I don't know, didn't keep the receipt, but it was cheap).
Kitty litter Fresh step crystals (about $7.00)
One Mini-Fan Approx $12.99

Small price to pay to eliminate your bud odors.
Seriously, major thanks to Children of Bodem for posting "how to".