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Building the car design out of foam is inexpensive and very forgiving. This is the trade off for being very time intensive. However if you have nothing but time to get it correct well then you can do some really amazing things with it on a tight budget :-)
The other benefits to being cost effective and forgiving is it gives you a core material that is extremely light weight. This core when sandwiched between composite material acts to greatly strengthen the total structure. This helps to create a safe and very comfortable ride.
Road and engine compartment noise is also reduced due to the foams insulative properties.
Many benefits and many things can be created out of foam for people with little to no prior experience!
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