project enclosure for 12PSU, prototype board and voltmeter

an enclosure/cover for a Mean Well 12 PSU Model RS-15-12 and a prototype board (75.5x51mm) plus enclosure for a panel voltmeter 5135-LCD DC-20 ( 79x42x26mm )
on a column.

The mains switch is from mouser.com :
http://eu.mouser.com/ProductDetail/E-Switch/R6ABLKREDAF/?qs=sGAEpiMZZMtNT9UGfLL4eD%2ffQBVjEjwGqdlbQiyh%252bKc%3d

datasheet of the switch :http://www.mouser.com/ds/2/140/R6-346382.pdf

tumbler switches are mini ones with ∅ 6mm neck

Originally the backlight of this voltmeter is b