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It least its a rather simple design, and not that tall. Making the stairs will be quick, getting them in place will be another thing all together, and them moving it is as completely other thing. I would probably go with sch. 80 pipe, it would add 50# or so but I think it would be worth it. The 1x3 is a bit overkill in my opinion, you could probably get away with .049 1x3 or .060 1x2. Doing the hand rail will be a bit of a beast. Good luck with that... If it all ends up square you did something right...