Autointstallation/ZTP

I've been working through automating the initial build of some ex switches (ELS without Enhanced Automation).
I've hit some snags, it's not liking the .conf file the tftp server is offering. Is there a way to debug the process? Should I be using a SLAX file instead of trying to load the config file?
I'm trying to to create a repeatable process that I can use for multiple models (24 & 48p).