I went in and checked manually on the copy file, there were some issues copying files (along with writing the ISO :P) and the like. It might have been due to the 64-kernel config on the drive or summat...
The ISO was close to completely empty, which explains the booting problem, but hopefully that'll be resolved--I'm testing it on a new flash drive shortly.
The Leapos Payload works perfectly, it's just the APE that's having a bit of trouble.