The advantages are many. first off, you have much better access for cutting outlets and plumbing holes. The time savings in plumbing and wiring alone would be worth it. It's A LOT easier to do it from the outside. Second, if you are using spray foam, you can use a hot wire cutter and smooth it all out. even if you are using foam panels they will be easier to put in from the outside. third when you miss a crew or nail on the inside work, you won't punch holes in the outside skin, and if you have to move something around, to make a change, you will have an easier time.
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