And I have now burned coaster number 2.
Not sure where I am going wrong....so I'll list what I am doing, and maybe someone here can tell me where I am going wrong.
Using UltraISO, I make a copy of my MUA disc as a standard ISO.
I then extract assestfb.wad from the z folder in the ISO.
Using ZipZag I extract everything to it's own folder titled assestfb.
In the data folder I then overwrite the herostat.engb, items.engb, and simulator.engb with the files from the mod.
I create a blank .txt file in the assestfb folder(the one that has all the different folders, including the data folder)
Using ZipZag I then create a new zip file named assestfb.wal (I had to choose an extension and there was no way to choose .wad)
I then rename assestfb.wal to assestfb.wad
I put the new assestfb.wad in the ISO and delete the original.
I then save as a new ISO (MUAPS2-NG.iso)
I then burn to a new DVD-R using UltraISO
I'm thinking my problem is coming when I create the new assestfb file with ZipZag (Or WinRAR if I want to use that program)
I have some ideas on what I may be able to do.....but I'm curious to hear any suggestions on what I am doing wrong as well.