I'm pretty sure I used the scripts to make a .30 overlay with few problems.
Stupid question, and I'm pretty sure the "I have to scp these into my linux desktop to do this, your setup might be different." is the answer, but I assume that the .image files created by the script can be burned on any platform?
You need to have a platform that allows you to write arbitrary format CDs. Most do, including the CDRtools-based UNIX programs. In fact, the only ones I've had problems with are the Adaptec programs (EZ-CD Creator and Toast), which "help" you out by checking for a valid ISO9660/Joilet/UDF/HFS filesystem on the image before burning.
As to getting the images to the machine, I'll leave that as an exercise for you. Scp works, as does NFS, FTP, portable hard drives (official or contrived) or any number of other methods.