Several years ago I saw a trike built out of, I think, a small front-wheel-drive Oldsmobile (Cutlass Sierra, maybe?). It was on Main Street during Bikeweek in Daytona beach, Florida the first time I saw it. I saw it again a year or two later cruising down U.S.-1 in Daytona. Whoever built it was very clever; they grafted the front fenders and rear quarters together at the wheel wells so it had the stock Olds taillights and headlights. The motorcycle frame was grafted somehow through the grille and under the bumper of the Olds nose. The gas tank was mounted in the motorcycle frame where the engine used to be. it was really nicely done, but I haven't seen it again for 4 or 5 years. Wish I had a picture...