President Trump may diss Mexico but designers and architects are flocking there. Now SCI-Arc has set up a satellite school in the capital and LA is learning from Mexico City. And, the buzz is starting for \u201cCrazy Rich Asians.\u201d Nelson Coates talks about the \u201cunbelievable unabashed joy\u201d of working as production designer on the movie and the role of identity in design below the line.