The reason this is some heavy is I asked my DIL what she wanted and she sent me a picture of the British reproduction table built of reclaimed timber. The smallest on they made was 84" by 52" with a 2" thick top and 6 x 6" legs.
I have some QSWO I had sawn from a tree that fell on one of my rental houses. (That's sort of reclaimed isn't it?)
I have reduce the top to 80 by 48" with her permission and I made the top 1" thick because that is what I had. I am considering Laminating and additional thickness around the perimeter of the frame. I weighed the top today it came in at 88 lbs. Adding the lamination will push it up over a hundred pounds I am sure.
I am making the legs hollow but the corners are heavily chamfered, so the stock on two sides will be an inch.
I stopped at Fastenal today and I can get 5/8 square head bolts 7" long. Let the Engineering begin.