Phone bracket for mask creation

This is a simple clamp to hold a phone in position over the D7 display, so that the camera is consistently placed in the center of the plate. Coded settings are for my Nexus 5X, but it's a customizer so you can adjust it to your phone. Phone size is limited to the width of the build plate in this design, and the camera is assumed to be centrally positioned between the two sides of the phone.

A couple of variations uploaded here; one with a 10mm standoff between the plate and the phone, and one with no standoff and 0.8mm walls.

Its intended use is for quickly creating a reasonable mask image for use in Creation Workshop, as suggested by Gerhard Eichenseer in the Wanhao Duplicator 7 group on Facebook here: https://www.facebook.com/groups/287910088208745/permalink/528854347447650/

The instructions here are paraphrased from Gerhard's post:

First tape a piece of thin white paper over the D7 display, pulling it taut, then project a full-screen white image (e.g. by slicing a bloc