Making progress on the Sketch Framer export thanks to help from @bomberstudios. Exporting is a bit tricky, I currently copy each element off-screen to export them in a clean way, so masks don't work yet.
Also the shouldCorrectView() in framerps.js messes up with layer group boundaries, commenting it corrects it.
Here's a working example: https://www.dropbox.com/sh/9aw4vqstj0vzxw5/zXM5E-K4W5
Just for the record: that bug was fixed in both Sketch Framer and Framer itself : )