Seems like massive overkill to me. If you are only going to use the jackplate to get the car in the air, and are immediately going to put a jackstand under the car before doing any work, why do you need a hardened steel superdoohickey that is that hard to work with? I guarantee that the jackplate is substantially stronger than the inserts that are welded onto the frame, into which the plate is inserted. If it's not the strongest link in the chain, the strength is wasted.
It's my complete WAG that a much cheaper, simpler piece could be made from cheaper steel stock, bolted to a plate of the appropriate size.
OTOH, I've read that you shouldn't use the hockey puck locations with jackstands anyway, which means that there is no reason not to put your floor jack under the hockey puck to lift the car, which means that a jackplate is entirely superfluous.
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