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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Quick and dirty (simple shape) would be a sheet of plastic and a heat gun. ...but, tight corners are difficult (usually you'll need forms/tooling for the tighter details).
more specifically...
Being made of soft foam, a seat is about the worst mold you can have. (giving you next to zero available tool pressure). So, you either make a rigid mold/pattern, or chose a very low pressure method. --Free forming a sheet of plastic and a heat gun, or a wet lay-up of glass (and a lot of finishing).
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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