Ok. I have found the answer, at least for that ROM:
In the /system/build.prop
file in the zip file, the first "section" has build properties, which details all the information that is visible in the "About Phone" part.
This is an example of it here:
# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=GINGERBREAD
ro.build.display.id=Hyper_Droid
ro.build.version.incremental=DDKT3
ro.build.version.sdk=10
ro.build.version.codename=REL
ro.build.version.release=2.3.6
ro.build.date=Wed Feb 1 15:11:04 KST 2012
ro.build.date.utc=1328076664
[...]
ro.product.brand=samsung
ro.product.model=GT-S5670
ro.product.name=GT-S5670
ro.product.device=GT-S5670
ro.product.board=GT-S5670
ro.modversion= v2.0
ro.author.name= Wilfred
[...]
# end build properties
#
# system.prop for GT-S5670
#