Hi. Here are some articles that might interest you:
Understanding GSE3 from a GSE2 Users Perspective · TimothyLuke/GSE-Advanced-Macro-Compiler Wiki · GitHub
GSE3.0 Block Specification · TimothyLuke/GSE-Advanced-Macro-Compiler Wiki · GitHub
Help with new trans from GSE2 to GSE3 - #6 by TimothyLuke