Build method and materials will make a big impact on the files you can use, and the amount of detail the files will have. If you want to do the EVA foam method, the files will be lower detailed to compensate the differences in building with foam. If you go the traditional paper, fiberglass route, the files can be more detailed, but that build method is more complex and time consuming.
Also, as always, the files that are available are only those that community members have made and distributed. There is no garuntee that there will be "high res" versions of the files we want, especially for newer games. I am more than happy to look theory the old archive and see what kind of Halo 4 Mark IV files we have.