ventilator, you mentioned that one can export a model with 2 skins already.

I fail to do so, probably, the skins have to be attached in blender in a way that I don't know.

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