Metal roof replacement and insulating an A Frame cabin

Guest User
I'm considering purchasing an A Frame cabin in NH. It needs a new roof and I'd like to use a metal roof as replacement. Presently the roof consists of 2x6 T&G Pine covered with 2 layers of asphalt. Here's what I'm thinking: Install vapor barrier, then 2x2 strapping vertically up the roof and then adding 2" of rigid foam insulation, then cover it all up with a metal roof. Do you see any problems with this approach? should I remove the asphalt shingles first? Do I need to install plywood over the insulation before installing the metal roof? Would you be able to ballpark a cost per square foot for something like this to help me factor in the cost to my offer to buy the cabin? I really appreciate the input!
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