saw your surfaces and sketch. But, it doesnt really tell me what exactly you want to do. can you do a pencil sketch or a picture or something to know what you want to do.
I noticed that your first sketch is unconstrained.
I recommend you start here http://home.pct.edu/~jmather/skillsusa%20universit
did you notice all of the error warnings in your browser (yellow triangles), I would start over from scratch.
I assume you are still working with this
It would have been better to keep this all in one thread.
I would do just a bit differently.
First thing I would do is take a picture looking directly down on the chair and one loooking directly from front.
Place each one of these as images into sketches and then scale the images to the (approximate) size of the chair. (there will be some parallax error - so don't worry about getting perfect)
Then I would do the sketches for the loft.
My sketches would be a bit different than yours, and often it is best to go a bit beyond the finished size and then trim back to the finished size.
You need to put those two images into your Inventor file on the first two sketches and figure out how to scale them to actual size (more or less - keep in mind that you can't get this perfect because of parallax error.
I'll let you work on it a bit and then come back and show you how I would do it if you have trouble.
(You might do the Vacuum tutorial in my signature for reference to see an example using images.