In preparation of receiving the Ascend 5W, I did some research and since the Honor 5X is less than 1 mm shorter than the Ascend 5W, I ordered this case from Amazon: https://smile.amazon.com/gp/product/B01DEFAIVS
You can also search for cases for Huawei GR5 (pretty much the same specs as the Honor 5X).
The case is a tight fit on the Ascend 5W and I’d rather have it snug than no protection for at all. Width is fine, but it is short so either the top or bottom of the front side of the case is pulled away from the edge ever so slightly. You can only tell if you look really closely. Openings line up well, but found inserting the phone in the bottom side first so the opening for the USB adapter is perfectly aligned allowing you to charge without force fitting the micro USB cable. The power button and volume rockers are off a fraction, but does not impact their use. Back opening was perfect for the camera and fingerprint reader.
I also ordered a Skinomi screen protector https://smile.amazon.com/gp/product/B01A6A4POA but the Ascend 5W came with one installed already. I have not swapped it out for the Skinomi yet. It seems to be a bit short when lining it up against the front of the phone, but would do the job as it would cover the majority of the screen.
When there are proper Ascend 5W cases and screen protectors, I will order them, but in the meantime, this case works for me, but that’s my tolerance for fit. You may not feel the same. If I determine the screen protector that came with the phone is not to my liking, I will put on the Skinomi on. I have had great success with Skinomi and Armorsuit screen and even full device protectors.
Hope that helps!