bigdave2009
Fish Fanatic
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The bottom of the tank sounds quite crowded but it doesn't sound over-stocked to me, just make sure you don't fill up the bottom of the tank with too much decor (although make sure you have some to help provide some cover for the fish).
edit: By the way, what gender/s are your platys?
The only thing I'd suggest is that cories like to be in groups of at least 6 of the same species. They become much more lively in groups! Looks like a fun tank otherwise. Watch for aggression from the gourami, mine picked on all of my other fish. You should post some pics if you can, I'd love to see your tank!