Although I don't remember shooting those pics,
Smokin Okie
posted a couple pics of the bottom of a Limo Jr that looks like mine...and I'm happy to take more pics if you want to see anything else. You'll notice that there's a hole in the bottom-center of the cabinet - that's the grease drain. There are rails on outside bottom of the cook chamber where you can put a pan to catch grease drippings, but I rarely have any grease in the bottom of my smoker because I usually use the bottom cooking rack to hold a big foil drip pan.
I personally don't know of anyone who's gotten their cabinet-style GF smoker anywhere near that hot. They are generally designed to run at sub-300* temps...although I've had mine as high as 320 a few times. I'm not sure you can get them to temps much higher than that.
Those MB Gravity Series rigs are a different design, and I've heard they can reach temps high enough for good searing of steaks - although I don't really have any direct experience with that type of GF cooker.
Red