Hi how, do you possibly have any images of the kind of shape that you're looking for? I guess I could search for iPad images, but if you happen to have a good one that shows this particular back panel detail that you are focused on that could be helpful to see.

It looks like right now you're basically getting the intersection of 2 extruded pieces - that may not be what you want to do since that will leave a kind of sharp edged crease where the 2 straight shapes intersect with one another.

You may want to do something like a sweep or a surface of revolution to make the back panel which can then be a more rounded surface rather than one with sharp creases in it.

Check out some of these previous posts for some ideas:

http://moi3d.com/forum/index.php?webtag=MOI&msg=1002.2
http://moi3d.com/forum/index.php?webtag=MOI&msg=3137.1

http://moi3d.com/forum/index.php?webtag=MOI&msg=3612.5


- Michael