Stephen, I know drip pans are great (no pun intended), but when I grill chicken for my family there isn't a drip pan big enough or shaped to fit the grill. I bank my coals on one side and use the other 2/3 of the grill for chicken, keeping it rotated. Point? I end up with plenty of grease every time I do chicken, which is plenty. After the first time or two of grease fires when trying to cook steaks or burgers or anything next, I came to a solution.
I light about half a chimney, dump it in the grill, put on the empty grate, and put on top of that any grates that need cleaning (I'm pretty lazy and usually clean my wsm grates when I need to cook, including the rib racks). The grease burns off, the gunk burns off, and the solution cost me 1/2 a chimney and a little time. Good luck, whatever you do.