Ultra compact USB C powersupply

After looking for a portable Power supply i try to make my own ,i used and usbc trigger, a dcdc stepdown converter ,a voltmeter and a potenziometer to make what i Need .

Can be used with Power bank on the go or with a Power adapter 

I used threaded insert for a Better finish but selftapping can be used 

I recommend to glue elettronic in place 

Part used:

USB C TRIGGER 

DC DC MP1584EN

10K POTENZIOMETER ( NOT CORRECT USE A 30K OR MORE)

MINI VOLTMETER

SPARE WIRE