Ok, Microsoft has granted up permission to use the Battletech IP. Being that we're in a much more advanced engine than previous MechWarrior games the models would really not do much good, since they're about 50% higher poly count and have much more detailed maps wrapped around them than was previously possible. Since we have to build the models from scratch, and the source data we have is widely varried, we may as well let the artist fill in missing details. I think they've been doing an excelent job to date.
Something similar applies to the sound effects. While Microsoft did a good job for sounds in MW4, their engine did not have as much dynamic audio capability, and did not feature things like aerospace fighters at all. It makes a difference, for example, what a mech sounds like walking over gravel vs grass. This is, of course, a good replacement for the usual walking generic sound. If we're forced to fill in the holes, no matter how good the sound guys are, the sounds won't be as great as if they were all made by the same people.