If you want to get all those models into the engine for use, then each one of them will need to be edited.
I can tell you write now, If you are not willing to make the multi textured models right in the FPE file or decide to put a scale value in the fpe file, you will have many problems, especially when light mapping.
fpe, bmp, x file, and the .dds files, must be in the same folder or multi textured wont work. also another thing is that Game Guru only supports 6 textures, any more than this will give you a problem.
Once you have a good static multi texture FPE file, then keep duplicating that one and change the name and info to apply to your next x file. It is actually quicker, then bringing them into the importer, being able to do 50 to 70 per hour.
It is best to learn UV mapping and combine textures when you can into a single texture sheet.
And yes it takes a time to do this.
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