Cool,
we've both maya/3DGS programmer. Yesterday I was studing how 3DGS write it's WMP file, if you open it in an text-editor you'll see that is not hard to create a maya-to-WMP exporter script. All we need to know is how to create MEL script to write in the WMP format.
I'll try to create my own exporter: Maya-to-WMP exporter script. So I can create block based level
I begun to create it yesterday, but I'm not a MEL expert programer, so I'll take a time to create it. But it will be much easier to create levels than MED.
When my exporter is ready, I'll send you a free copy