I have had success when making turkey/chickens by removing the drip tray and putting a catch pan in the warming drawer to collect the drippings. I just try to make sure to center the birds over the pan so as to not make a mess.
A great idea for the PG500/1000 series pits. Admirable.
I agree, that's actually a great idea.
I was going to suggest that if a water/drip tray was desired, I'd make sure I had my turkey raised up above it by at least 3 or 4 inches. I tend to like to get my food up as far in the indirect area as i can, where it's warmer... Many things I cook directly on the upper shelf... a large turkey might not fit that well on the upper shelf though... So, having a drip/water tray down well below the main indirect cooking grate, could be just the solution.
I have like a 18 pound frozen Turkey , that I bought after Thanksgiving. I'll likely cook it either on Christmas, or sometime between Christmas and New Year... I think I'm going to try the drip tray/pan thing down bellow when I cook that bird. But then, I may wack the bird into pieces and cook breasts and dark meat all separately too, so well... there's lots of possibilities.