This is looking pretty awesome!
May I ask though, will this by any chance be open-source?
I'm interested in NSE 2.X working as a tile editor, yet I've had problems implementing, or at least finding for that matter the offsets of the tiles...
A simple "Open in NSE" button could be a wonderful addition to this project, as a tile editor, and might take allot of the stress out of the whole import and export thing we've been doing for tile editing.
IDK anyways good luck, this looks really promising :D