Here are some other photos of the base. I carve the through slot and inset into the bottom of the base. Install the LED and then apply a thin foam sheet. This covers the LED, gives a nice 2 tone look, is inexpensive and protects the surface of whatever you put the sign on.
@MikeStinger LED Strip: https://www.amazon.com/gp/product/B01ICVGJG2/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
@AlainGauthier Its 5-12 minutes for these particular signs. The strip is hot glued into the bottom groove.