Intro: I tried to convert my old 99 Maxima to leather seats about 5 years ago. I found a guy parting out a 95 with leather seats, so I bought the interior to make the switch. While the front seats fit without any problems, the rear seat didn't fit, so I ended up selling the two front seats to a guy that was building himself a gaming station. But I was stuck with the back seat that I stuck in my shed and forgot about.
After moving house this summer, I was reminded that I still had that back seat, and since I didn't have much furniture left from my divorce, I decided to make a sofa out of that old rear seat. Also, since the funds I have are tight these days, this was entirely made from material I already had from other projects.
I started by making a base platform from some nice quality 1/4" plywood.
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You can already see in this picture the problem that I was gonna face during the entire built. The cushions are far from straight, so it made the adaptation a little hard. For exemple, I had to cut the two releive in the bottom because the cushion was lowered in that spot.
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I made two steel pans for to hide the parts that were sticking out, and also a front cover plate because the front of the cushion wasn't straight.
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Then I stuck some 1.5" tubing at an angle under there to give my the basic layout. I removed the cushion and started to had stiffeners and plates for the armrest.
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I went a little nuts with the lightening holes. 
With the base like I wanted it to be, I turned my attention to the back. I again cut out a support platform out of plywood. I then stuck it on the base and tried to acheive the best position for it.
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With it in place, I built a support structure from 3/4" tubing, angle iron and plate. I then dissasembled the thing to finish the welding and paint the steel structure.
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I had a lot of problems with the paint, but I finally got acceptable results, so I could start the re-assembly. At that point, I decided to make the armrests in some leftover oak wood. I chose to make them in the shape of a wing profile because I'm a huge dork.
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Stuffed the cushions back in place, but I was left with the sides that looked unfinished. Made a little template to fab some aluminum cover plated for the sides.
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With that done, I could move it in the house. And there it is in it's place
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It was a fun little project, and I am happy with the results. But if I wanted to make something like this again, I would start with a more simple rear cushion from something like a minivan or SUV. I have about 30-40 hours in that thing. Also, I was suprised by how innacurate the cushions were. The mounting brackets have a good 1/2" difference side to side.
Hope it inspires others to do something similar.
Great work!
