The electrode contact localization GUI is in progress and a first draft that incorporates MNE style and helper functions is almost finished. I worked on handling the coordinate frames in a easy-to-understand way, and I worked on refactoring and renaming the appropriate functions and variables to be private as well as simplifying a bit like not plotting the pial surface to add back later. This week I'll finish the draft, get and incorporate reviews and work on tests. Hopefully soon it will be integrated into the tutorial with helpful images.