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@bombcup
Don't despair, my beater looked a lot like this. Choose a cog with a good broad shoulder, stick a couple of shimano 10 speed cassette spacers on the hub, put the chainring inside the spider, and if it's still more than 2 or 3 mm off use a 3/32 chain which has a bit more flex.
Don't use a straight edge - Look down the frame with one eye closed, move eye toward wheel until chainline is correct.