Depending on your printer extrusion width, choose walls to build up to 2mm. I used 3 walls and the only infill needed was at the top after the base was printed. The Honda Odyssey does not have very many places to mount something, the original model only fit small-ish phones and was bigger than it needed to be. I modeled mine based on the one listed, but reduced the width by a couple of inches and increased the depth to accommodate other devices including a case.
Unless you have an otter box on yours, or something as ridiculously thick as that, this should work for most devices. I may add a thin layer of sugru or some rubber strip to the base so that it prevents any slipping while in transit if the phone is not in a tpu or similar case.