[rfuerst911sc]

My 2 cents: short term just use it as is . As you live there and go through various rain/cold/hot/humid cycles you will start to see the buildings short comings. You will also determine if rodents are an issue .

To me it all revolves around the siding . If the existing siding is in good shape and you like it then that is one path moving forward . If the siding is not in great shape and/or you don't like it that is a different path forward .

Keep the siding I would look for used sheets of foam insulation and cut to fit in between studs . This helps seal/insulate and helps with rodents . If you decide to replace siding then you plywood the exterior and house wrap then siding of your choice.

I wouldn't do either until you use the building for a while , you may find its perfect as is.