I've done several pigs, as well as briskets, shoulders, ribs, turkeys, etc in my Cajas. The older models could get a little messy, but a bucket of hot water, followed by a hose always cleaned them right up. The new "semi-pro" model has a drain in the bottom, so it's even easier to clean up (and collect the broth!)
Also, I've found that three "1/2 sheet" steam table pans (disposable) will fit perfectly in the bottom, with no gaps, so I often use those in my older Model #1, esp when I want to save brisket broth, or something. My Cajita China (the backyard model) fits one of these pans almost perfectly, as well.
Never had any issues with smells, either.
I've got lots of La Caja China pics and recipes on my blog, feel free to drop on my anytime! Roberto Guerra (Owner of LCC) and I are finishing up a La Caja China cookbook right now.
Have fun!
-Perry
Burnin' Love BBQ
http://www.burninloveblog.com