md3 models to export to starlogo (quake 3 engine)

Hello all,
I am an artist working with a group of young people in Liverpool, uk.
I am trying to help them create very simple custom shapes with simple textures on them, to be exported as md3 files to Starlogo TNG which is a piece of educational software from MIT which is piggybacking on the Quake 3 engine.
I have been using the python plug in to blender to export the md3's (in fact I have tried several md3 export plugins), but when I bring them into Starlogo it crashes, or it just dosent see them.

-Has anyone got any hints re: exporting .md3's from Blender?
-Does anyone know of any programs which are simple to create basic low poly, textured models, and export them as .md3's.

I am in a bit of a panic as I have a deadline to work to.

Any help or signposting will be massively appretiated.

Cheers
Neil
:eek::confused::D