Call and talk to Lonnie at Emotiva and he will price it out. The web site does not have the chassis cost only the modules. I just noticed they are showing a backorder on the MPS-1 until 9/1 so that may be a deal breaker.
I know they would do this as when I was getting mine Lonnie told me about one they were building with the dual channel modules. That was a 14channel amp

and weighted 158lbs (sheep).
Here is a link to the review here and you can see how the modules go into the chassis
http://www.audioholics.com/reviews/amplifiers/emotiva-mps-1