I've now got the background in place in the aquarium. I put a light bead of silicone around the back edge to hold it in place and gave it a couple of days to cure. Here's some pics from all angles of it in the dry tank.
From left side
Top down angle
Close up shot
Looking straight down
I forgot to mention that I had cut out overflows. Here's a close up look at them.
Here's a front on shot. The bottom portion will be covered by live rock placed on the base plate.
Overall I am pleased with how it turned out. Now looking forward to getting it wet.