Oh I see. If those apps didn't work, I don't know. You may still be able to sideload gapps in the android recovery, but I don't know all the steps. Maybe the steps to root the W3D may work, but I'm only guessing at this point. To truly root would require adb access and allowing super user access to the device through terminal commands, but that goes beyond my knowledge.
There may be someone on the Snail forums that may have posted a method, but you'd need to translate the forums conversation, so information might be a bit scattered. It's gonna take some searching, and lots of trial and error. Good luck!
Also, maybe even finding a phone with similar hardware and software that has a root method. That method may work on your device, perhaps with some tweaking. As always proceed with caution.