Extending the rear deck 4'

Cat nip

Petty Officer 1st Class
Joined
Jul 25, 2015
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288
I got new logs that are 2 feet longer so that will allow me to add a full 4x8 sheet of plywood and I have 2 questions. My old x members are 2 1/4" tall and all i can find is 2" tall, should i add another piece od 1/4" over or under it or use 1/4" aluminum flat stock as spacers? And will 1 2x2-1/4" aluminum c channel per foot be sufficient? I am running a 60hp 15" behind the last x member.
 
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