Aren't 3D printers just amazing! Ive and Co. can print out models like this in-house and test them out in the hand, against the ear, pick them up put them down, pocket them and then make a decision. (Apple has had 3D printers in their design studio for several years now)
I know my sister doesn't like the shape/hard edges of the 4, 4s, 5 and 5s, and actually chose to buy a second hand 3Gs on eBay instead when her old 3Gs broke. She'd love this phone.