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Brian, are you talking about putting a 90 corner radius around the front edge of the seat back? If so, you could take sections from PVC pipe split lengthwise (or whatever tube of the appropriate radius you can find) to make the long straight runs then fill in between them with plaster/bondo and use spline of a matching radius (to the tubing) to form the filler. Let it harden up, sand a bunch, then pull a fiberglass mold off of that (or if it is nice enough use that "mold" as the final part).
You could also cut some radiused stations to go inside the bondo (like an egg-crate body buck) to help you get a nice surface on it.
Or just glue up a bunch of easily-sanded wood scraps to make a big U shape and then cut/file/sand that to match the tail section and form the radius.
cheers,
Michael
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