Thanks T!
Well, hmm. I stripped it down to just rendering one angle and just updated the paths to my own local files, and it looks like it rendered with the correct textures:
http://applenova.com/etc/brad/minecraft/world/
However, I did see in the logs an error finding "command_block.png" which tells me that it's apparently running a 1.8 mode, not 1.9, because that is one of the renamed textures in 1.9. I'll keep poking at this too...