Is it possible to use scripts, files, etc. from the SWBF1 mod tools in order to edit the Marvel4's downloadable BF1 maps, like for which factions and which classes to have? If it is possible, how do I do this, what steps do I take?
Think of a finished mod map as a compiled program. If you have the source coded (scripts, lua, etc.) then it can be possible to convert from SWBF2 to SWBF1. However, once compiled into a final map, it is pretty much not possible.
That said, we have many maps from SWBF2 into SWBF1. Be sure to check out Sereja's maps in our download area, which include SWBF2 conversions.