This is a sign we made for one of our projects. The back is made from Extira and painted with exterior latex. It was routed to accept a 1/4" thick prefinished material . The prefinished material had the letters and logo routed into it as an inlay. The letters and logo are all acrylic, covered before laser cutting with black reflective acrylic tape. The colored medallion at the top left was made by printing on the Canon printer, fitted to a piece of laser cut acrylic, adhered with 3m adhesive, then covered with 1/16" clear acrylic. The medallion had 1/16" holes punched in it to accept brass escutcheon pins that hold it to the back and lend decoration.
The acrylic letters were adhered to the backing with Weldon #16.