Unit morph for all units tutorial - StarCraft

For Example - in Gravity mod Ultralisk - next stage of zergling development. Zergling, actualy, can't morph, cause it has no specific coocoon unit. However it can be fixed trough firegraft/stardraft plugins. I've used GPTP 2.4 to allow zergling morph. You should download GPTP 2.4, and Firegraft 1.16.1 to mess with this:
1) Open project. Go to "unit_morph.cpp", and after lines:

  if (unit->id == UnitId::larva || unit->id == UnitId::mutalisk) {
    if (unit->canMakeUnit(morphUnitId, *ACTIVE_NATION_ID) == 1) {
      return true;
    }
  }

paste this:

  if ( unit->id == UnitId::ZergZergling )
  {
	  if (unit->canMakeUnit(morphUnitId, *ACTIVE_NATION_ID) == 1 )
		  return true;
  }

if (unitId == UnitId::hydralisk )
    return UnitId::lurker_egg;

if (unitId == UnitId::hydralisk || unitId == UnitId::zergling )//Secondary Coocoon
    return UnitId::lurker_egg;

3) After this you may compile your plugin. Zerling will be able to morph in any other zerg unit. Actualy that was all coding part. If you know about dat requiments you needn't to explain the rest. But there is a small thing, usefull to know:

4) Zerg don't do abortions. Also, in real life (insects, or amphibous) metamorphose once started can't get interrupted. So, open Firegraft/button sets, and select button set 17 (Egg/Cocoon); in lower right side of window you can se list of units using it. By doubleclick on unit you can go to unit options page in firegraft. For each morph unit must be selected button set "None". This need to avoid 2 bugs in one time: 1st - connection between unit's native hatchery (after morphing unit will run to hatchery's rally point), and second - changing unit type on cancel (you tried to morph queen in matriarch, and when cancelled - got mutalisk).

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