Yes, the plastic spinner can be used as a pattern to take a mound from (as long as it's not been cut from it's based and is all floppy). Epoxy glass or even carbon cones can then be laid up.
Something along these lines..................
http://www.fighteraces.co.uk/portfolio/avro-anson-spinners/Cost wise.......if it's a 2 part mount (more time consuming to lay up, but easier to extract the finished parts from, so swings & roundabouts), I'd estimate 3-4hrs to produce the tool (+ materials cost), then maybe 1/2 hour per cone, again + materials. That would come in between 40-50 for the tool and around 12-15 per cone for glass, a little more for carbon.
Let me know if I can help your mate out.......I have 2 other spinner jobs coming up in the next month or so, so could run this one at the same time.
Phil
