i asked him real quick about it, and he said he stripped out about 100lines of code....
if your going to play around with the port1_config_descriptor, forget about using it in descriptor.h, he is calling for it in port1_config_descriptor.h in more then one location. just use that file to reflect what you want to do.
again, make -f Makefile.payload is the command to get the .h file.
i took the liberty of copying your payload from descriptor.h and put it into the port1_config_descriptor.h and compiled and the payload is no longer successful. the ps3 boots, but it does not boot into debug (no install package,etc).