e-motion Remote Shield v2

UPDATED VERSION: I've made a number of changes to make the shield more robust. The shield itself is thicker, and there is extra space between the remote case and parts of the shield--which had been in contact and could result in the shield breaking if the screws are tightened too much. Fixed these things, along with a few other minor model tweaks. This is a shield for the Alber e-motion remote control ("cruse control"). The Alber e-motion wheels are built to fit on standard wheelchairs, and provide power-assist mobility for wheelchair users. The Remote is a Bluetooth-connected device that allows hands-free speed control for navigating up and down inclines or over longer distances. The remote has a large knob that spins continuously--CW for faster speeds, CCW for slower. One drawback of this design is that it is easy to bump into the knob and thus start moving, or speed up, by accident. This shield covers part of the knob so that it is less likely to be brushed against--but