Hi, may I point out that just filling the cut with molten copper would't do it. There would be no restraining on the upper rock They have to make the dual cuts then fashion the insert to a hammer fit on the lower rock. The upper part would be a loose ft in order to position the upper rock.
As for the verticle fit ---
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AND,,
On top of all that,,, there were "knobs" much like the "biscuits" that are used to join wood together.
The huge blocks MUST be "locked from all directions.
I have seen old images of the "top" of megalithic blocks with those carved "biscuits" in place and in other images I saw corresponding set of matching notches for them to fit into.
The PRE FLOOD world was much different than we are led to believe. Sure there were the hunter-gatherers.
BUT there also were very sophisticated civilizations/societies which had working knowledge of high level mathematics, earth sciences and astronomy.
In MY opinion, we HAVE been lied to for the entire existence of "civilized" time.
Some GROUP IS with-holding information on the real truth of the origins and purpose of mankind.
And from what I am reading-seeing,,, it was NOT good.