There was one floating around Keystone while I was working there. Was a little heavier than aluminum but seemed to work a little better in spray or low glue situations. Biggest problem I saw was that it took much longer than regular chassis to change out motor, this was in the time frame when OMO was just starting up so most racing at that time required multiple motor changes. They were also about twice the price of other open chassis at the time. If memory serves me they were imported by GT-1 Gears, so, if there are any still kicking around, I'd start looking there.
Improving performance one hazardous material at a time.