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It would be nice if you had a few coloured 3D renderings of the engine blown up to say A3 which would enable the punters to see what goes where, maybe even an exploaded view though a transparent rendering is just as good.I think if you get a few of the basic fabrications made proir to the show then you can just give them a clean up and bring to size live.I'm not going to have as much time as I thought that weekend unless I can get someone to let the dog out, besides someone will need to accompany you on your travels around the show site to keep your buying habbit in check.Have you been risk assessed yet? J
Or you could save the corrections for when you make a bigger version, would be good with a 8-9" flywheel