You can create the neo file using my tool, neoconv.
Of course, you'll need to rename the incorrectly named ROMs in the ZIP file first:
274-c9A.c9A -> 274-c10.c10
274-c9B.c9B -> 274-c11.c11
274-c9C.c9C -> 274-c12.c12
The final neo file is then 123 MB (129,503,232 bytes)
I have successfully...