Hi, Luke, I got following problem on your macppc.fs at sysinst,

|     Status: Failed: command failed
|    Command: /usr/mdec/installboot /mnt/boot /usr/mdec/bootxx /dev/rwd0a
|     Press any key to continue
|--------------------------------------------------------------------------------
| installboot: nlist: /usr/mdec/bootxx: symbols not found

Just for your information,

(I was not being necessary intending to test your new bootxx, but just
install sets to another disk unit by using your macppc.fs)
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Makoto Fujiwara, 
Chiba, Japan, Narita Airport and Disneyland prefecture.