Unless its a race car do yourself a favour and use thick enough aluminum that it wont rattle constantly. Also I would use a little insulator (rubber,tar paper etc) between the sheet alum and anything else it may touch. Those really thin panels drive me nuts when they buzz from engine vibration.
CoryM
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1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada
http://www.geocities.com/chevroletc1070
"Take up our quarrel with the foe:
To you from failing hands we throw
The torch; be yours to hold it high."
Lieutenant Colonel John McCrae, Canadian Army
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