All the structures and ships a race can use is in the (racename[tech in this case]).entity file. You might have to remove something if there is no more room in the UI for tactical structures though.

Open up playerTech.entity

Under entities->planetModuleInfo->Page:1 add your Phase Gate entity (original is PLANETMODULE_ORBITALPHASEGATE or so)

Under entities->researchInfo add your Phase Stabiliser research subject (original is RESEARCHSUBJECT_PLANETMODULEACCESS_PHASEGATE I think)

Increase item counts as always.

If you are using the original module and research you might have to move a TEC research for the button to show up. If you are using a custom research change the researchPrerequisite in your PLANETMODULE file to your custom research, and move that wherever you want in the techtree.

Use the Dev.exe to check for errors (overlapping research buttons, typos)

Look at GalaxyScenarioDef. Then try adding a Vasari unit to the Quick Start setting. At least the playerRace.entity is organised, uses direct entity references and has the important information at the top (and the very bottom when adding new races)

GalaxyScenarioDef is a jumbled mess of random information piled up into one file.

I got the icon to show to build it but i still cant get the research to work right it wont show it or i cant change it without killing the game. making it minidump everytime i start it up