Tried making skeletons with old tent poles, and discovered that even if they are only slightly flexible, they will distort when the fabric is upholstered over the frame. Result - panels were wrong shape.
Now I use wood frames that are built rock solid. Of course this is for us techno-challenged ones who have not mastered Cadware. But it works for me.
Some good pictures are posted by Roger on bushwalking.org.au in the DIY - My Designs - Summer Tents section. Worth a read, I think.