MCM you did a fine job of restoring the Mantis prop car. It is indeed a authentic screen used prop and is one of one. I had it for a long spell of time and purchased it direct from a prop wharehouse in Vancouver, BC after it was in a Tim Allen Xmas movie filmed here., also the Mantis show was filmed here to save $$ after being filmed in LA. It was painted red when I got it. There is much more to the story as to why the back end was sliced off etc and there are more Mantis props still at that prop house..last I checked.
Good thing I took molds off it before I let it go on ebay.