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Do you have a sketch of exactly what you want to do? It sounds like what you want to do will effectively double (or more) the loads on the columns.
Thank you. I will look at it and get back to you ASAP.
I can check the posts for the additional load, but closing the sides will introduce a lot more wind load that I would not be able to comment on (other than to say you need a full lateral analysis and lateral load resisting system) without doing a full lateral analysis.
I was asking you to confirm you're ok with the limited analysis this question buys or if you wanted the more in depth analysis