create a folder under the mods-entrenchment 1.02
create a gameinfo folder in the new folder
copy the program files\sins\entrenchment\entity.manifest into the new folder
copy from your reference set of 1.02 the gameinfo\starbase*.entity files to the newfolder\gameinfo
go to the newfolder\gameinfo then open in notepad each of the starbase*.entity files
look for a line with maxUpgradeLevelCount and change the number at the end to the number of upgrades that you want to be available
save the file.
if you need a copy of the entrenchment 1.02 references there is my un-offical ones here .
by the way I thought that you were a bit ferther into modding