If you need a queen sized bed, just buy a bed.
This took us about 2 1/2 hours to build. It wouldn't have taken as long, if page #2 had been included. The instructions had two page sevens, so we had to find instructions online. The mattress is pretty thick, it's definitely heavy. You'll get a good night's sleep.
We also had a lot of extra parts that aren't even apart of this futon. The photo for this futon is also a little misleading, the real cover slouches, and the back sits up pretty high due to its length. Overall, I would recommend this futon if you need a large mattress and are short on space (such as living in a studio). Here's a link to an instructional video for putting this futon together, if you need it: https://www.youtube.com/watch?v=Ft5suJSRhp4