adjustable multi voltage power box for the stacker and trommel

voltage list
water pump 12v marine water pump
stacker runs best about 6v
shaker motors and shaker drum run best at about 3v

parts list
1/2 in screws for plastic
2 buck LM2596 DC-DC converter
4 push button on off switch
10 sets Power Jack Plug 2 Pin Wire & Socket Connector
https://www.ebay.com/itm/Lot-of-20-Power-Jack-Plug-2-Pin-Wire-Socket-Connector-Lead-22-AWG-300V/321824105800?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

the bus block
strip 2 pieces of wire abou