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Fill the radiator up with water and then weigh it. Aluminum radiators aren't heavy, but the water that will fit inside them is. On top of that, radiators (especially aluminum ones) are very vibration sensitive. The support has to be sufficiently rigid as to not create additional flexing input and to properly resist the isolator mounts (you are counting on using elastomeric isolators for the radiator, right?).
Why aren't you using a normal core support? I would think you could get one in a junkyard from an insight that had been mounted by a semi. That would solve your concerns about radiator rigidity and provide for a hood latch.
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