Couple of questions about units Thread

I've decided to fix the Galactic Conquest version of The Old Republic at War by Geroenimo for my own personal use (for now only for Sith Empire alone), since he officialy cut himself from that and I have encountered a couple of snags:

Rebel ships are still in the production tab and I seek a way to eradicate them. I tired the following:
- Copy SPACEUNIT xml files from EaW into ORaW file with x-wings, calamari ships etc. with required 6 lvl starbase, resulted in crash EVERY FRIGGIN TIME.
- Intruding into the original SPACEUNIT files of EaW and FoC and tried the same, no effect.

I assume these units must be described somewhere in the ORaW files, but I just don't know where.

Rebel heroes don't look nice for the Empire so I wanted to change their icons into soemthing more imperial:

- I found UniqueUnits xml file in ORaW describing rebel heroes and even a D. Malgus icon but even a slightest intrusion into that file causes crashing. How can this be bypassed? I underline that I use a plain notepad to modify XML files.