I wish the OP the best on his projects, I may try the kickstarter route myself someday. I'm an embedded hardware developer, I also dabble in the packaging.
Food for thought:
1. I can't imagine any smartphone owner that wants their scratchy keys anywhere near their device.
2a. Detachable gubbins have the nasty habit of detaching when you least want them to. I don't know what materials you're using but a flexible plastic will never hold and a rigid plastic will break. If the ring is metal it'll probably hold up but will also require a pretty nifty clasp as to not wear, damage or shear the plastic casing.
2b. Have you ever seen a plastic keyring?
3. You don't need cutouts for the antennas in the plastic.
1. The keys/keychain are just for just to illustrate options. You can clip the ring to your nipple ring for all I care. If you had watched the video, you would have saw that he clip portion of keyring detaches from the keys. It's a detachable keyring so the key half can stay in your pocket while you use the clip half.
2a. Other detachable gubbins weren't designed by me. The clip and case have been riding around in my pocket for months now. Works great for me. It would be just fine in your skinny jeans too.
2b. No, I've never seen a plastic keyring. Never, ever.
3. According to Apples technical guidelines for case manufacturers, certain plastics do block signal. I haven't settled on the final material yet so I designed for the the cutout now. From a CAD design perspective, it's easier to design the cutout now and remove it later than it is to try and add it later to the CAD drawings.
I do appreciate the feedback but a lot of it based on incomplete and erronous assumptions of the product and product design. What you see is prototype #1, so yes, of course there is room for refinement.
