Can i just build 3 boxes out of 2x8's and make the bottom one larger and then the top two 10 inches small on both sides and then stack them on top of each other until it is level with the patio door.
Do i have to install a ledger board? If so should i attach the top one to a ledger or the bottom one?

Do i have to install a ledger board? If so should i attach the top one to a ledger or the bottom one?
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