Amazing work! Thanks for all your effort. I downloaded the card styles subdirectory without svn by using
http://kinolien.github.io/gitzip/ instead, to get a zip file. I logged in to get the token first. And I was able to create a 300DPI test card (stage ally, why not) using the win64 / MECCGseteditor_custom executable. Sweet.
Though I did run into an issue with the existing MSE sets (ATS, DM, etc). The console gives: file note found: 'local_image_file("picture80")' in package 'C:\...\Dark Minions.mse-set'