I know that title doesn't sound applicable to this forum, but bear with me...
I have a 24"x24" laser engraving tiled onto four 12"x12" granite tiles, and I'd like to hang it on my back garden wall. Fairly dry climate (southern California) but we do get some rain, although taking it down during "rainy season" is an option if absolutely necessary.
My original concept was to epoxy (or whatever) the tiles to a piece of exterior plywood and wrap with a redwood frame, but I thought I'd pick the brain pool here for easier/better/more-durable alternatives. Anybody?