Drop-in switch holder for a 1590G sized enclosure. This will hold two mini slide switches (cutout is 4mm x 7mm) and one 3mm LED, with room for excess wire to be hidden underneath. There are cutouts on the ends for your wire to be ran through. Just install your switches and LED, tuck your wires, and epoxy this baby into your box.
This gives you a nice internal switch setup with a spot for your reverse polarity LED. If you have any recommendations or requests, just let me know and I'll try to accommodate.