A friend recently came up with a druid 5/fighter 1. He took the fighter level to allow himself to use heavy armor. He has a full stone plate and a wooden shield, and he uses Wild Shape to change into a dire tiger. Apparently, the armor and shield get absorbed into his new form, and stack with the dire tiger's natural armor to get him around 28 AC at lvl 6, with the ability to cast spells (with the natural spell feat).
Is this legal? I'm having a LOT of trouble imagining a druid in heavy armor and a shield, casting spells with no penalty whatsoever. I know druid can be broken with the natural spell feat, but this seems a bit too ridiculous to be legal.
This is standard Pathfinder with no 3rd party rules.