you've probably thought of this already, but unless you're getting your copper pipe really cheap you might want to consider the cost of a used heater core, you can pick one up at a local auto recycler/junkyard for ~$5. as long as it doesn't have a leak you're good to go. typically a chevette or similarly sized one'll work nicely. but don't let that stop you from making your own rad if you want to go that route. just thought i'd point that out to you.
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