I think the idea that semis are lighter is an illusion. My Peerless Bassmaster (identical to the JC by the original makers) weighs the same as my Precision. I used to own a ‘66 Gibson EB2 and that was over 9lb. I think this is because the bodies are wider and there’s probably just as much wood in them. Many, but not the JC, have a centre block to cut feedback.