Yes, there is the SDK, but it is still a lot of work to use it as a base for an exporter.
Its probably less work for conitec than for anyone else.
If there is anyone in the community who wanna do it and who _can_ do it, that's great, but I don't know how to do it.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt