It is the source code for the ion cannon centre antena fix and the momship code for being buildable.The antena of the centre is able to open now. It is really an advantage to be able to build the momship because you can not abuse it by insta spawning as in vanila and that it allows the ai to use the mom ship.
Logic command and logic command set are not edited. They are mostly as the vannila but contain redundant code like the mini orca being buildable or that the mini mcv's being buildable at the warfactory.
You can fix that by eitehr removing the line of that reffers to the mini orca.
Other than that,it also removes the button for the momship being able to insta spawn.
On a side note.you might wanna change this
UnpackTime="3s" >> "0s"
becaiue there will be 3 second delay to activate the ion cannon.
Ie,change only the parts that are in quotes.
ALso,the the momship xml is required because it restricts it from being able to be build at the time you build the alien airfield.Also, it changes the default health and speed of the momship from default.
Ot make it more useful because it cant insta spawn now.