A terrific mega puzzle! There are some interesting choices. I always have trouble as world maps are like a clock, every time I look it is different. I wonder if blue acrylic for ocean would help and even have all those Islands have at least an engraved spot and the diverse areas of China or perhaps India have a score for their locations. 
But a very intimidating piece of wall art, Perhaps laid out lightly together so you can make new pieces every time it changes. 