What's the cost to complete this unfinished carport?

Hi,

So I bought a house with an unfinished carport (sellers didn't finish it due to winter). It has the proper permit. The walls, roof, windows and door (leading to backyard) have been completed already. I am not looking to turn it into a garage. I believe it only requires siding on the two exterior walls (vinyl to match the house) and maybe some other small things (I'm not knowledgeable on this subject). I am not looking to finish the interior. The carport fits one car. It is approx 20 ft long x 8 ft wide x 7 ft high. How much approx would this cost? And how many days? I've attached some pics.