Okay I'm trying something else and spent some time making new images.
I basically opened the ISO's in OSX, copied the contents of each disc to MacOS9, created a new hybrid extended hfs + windows disc for each set of files and burned discs.
When inserted, the disc mounts normally now and the installer recognises it and seems to be trying to install (not asking for the CD).
I will upload a 3 CD version and a singular DVD version in toast image format in order to solve this issue soon if all works out. The mac "update" installer will also be included on Disc 1 because it can be and this will clear up confusion.