Why isn't possible to use a20 map in NMP?

[eeloc]

Hi,

I'm new in the xbox modding, so it is just a general question.
Why aren't the great hack people able to use the original levels texture in a multiplayer level.
And make a great mod out of it. I tried to load the a20 level in sparkedit and works fine.you can navigate all around in this level and you see all different textures and models used in this level.
It is clear that it isn't simple to do this, otherwise the great mod people all ready did this.
Can somebody explain this to my??

Greetings,

eeloc ( just want to now how it works)

[frozenflames]

1. NMP is a MP map thing
2. a20?!?!