I have a spreadsheet I keep of dimensions of a number of guitars, especially smaller ones I'm interested in or own or have owned. It includes the GS Mini and the GC. Additions and corrections welcome.
https://docs.google.com/spreadsheets...it?usp=sharing
This page is helpful about the Taylor GC 12-fret vs 14-fret differences, and includes a good photo showing the differences. The neck is shorter, but the other dimensions look the same:
https://www.taylorguitars.com/guitar...cialty/12-fret