After following these steps you should be up and running and able to test
Hook everything up and test it:
Everything here is rather straight forward, but we'll cover the pitfalls we encounted
We mounted the pi to the back of the touchscreen with a set of motherboard spacers, then the amp on top of that again
To power it we grabbed a 16V IBM thinkpad powersupply we had kicking about, cut off the barrel jack so we could pull the cable through a hole in the case, we soldered on two pairs of wires where one goes to the 5V Buck converter, and the other into the amp hat, in theory the amp+ should be able to power the raspberry and accessories as well but turned out being too weak to handle the touch screen as well so we're using the buck converter to power the display.
Fire it up and finalize software setup:
you should be able to reach the raspberry on whatever IP and port you've set it up to, and if you had set up mopidy as a service its already running, play around just ensure to crank down the volume if you have some petite and sensitive speakers like we have, I have a bit more tinnitus than before starting this project due to the volume being at max.
we set up the raspberry to launch chromium and open the simple-web-client page in kiosk mode, we also tweaked the css for the client a bit so that it is white on black instead of black on white.