I've been building an addition to the front of my MH using a clay/sawdust infill. Here's
a YT video about my project:
http://www.youtube.com/watch?v=zgz2nc8wBG8&feature=channel_page
or search for:
9-15-08 Infill with Sawdust - Clay Slip
Pack
http://www.tokbox.com/Ga9