I have been asked to build a sign for a local charity that will list donors/ sponsors. It will be outdoors and therefore subject to temperatures ranging from -10°C to +40°C plus rain etc. I have attached a picture of what it will approximately look like. The problem I have is that there will be about 12 aluminium rectangles, that are all 210mm X 90mm X 3mm in size, mounted on a backboard. My idea is to use a CNC router to carve out the recesses. What I am not sure on is how to mount / fix the plates to the wood. I will have to varnish the backplate to cope with the rain but I am not sure if I can glue the plates or whether I should manually fix them somehow. As the plates have already been delivered I cannot change their specs.
I would appreciate any help I can get.
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