This has already been said, but a lot of people are missing what has been pointed out repeatedly. You don't need to build different sized rinks. The young kids now are playing half ice. There are rink dividers out there that mimik real hockey boards (with rounded corners and everything) they are just only 2 feet high and have a door and everything.
These kids are also very young, so you don't need to worry about faceoff dots, blue lines, off sides. It is basically pond hockey out there and it's supposed to be fun.
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