72: your bench looks like it's going to work out fine and i think the screws bolted through would be better and not that much harder to remove. so Baldors on both corners and a 519x vise on the third. looks like you might need an old Craftsman drill press on the other corner if you can find one as easily as you do vises. get the Craftsman with the heritage badge and the extra slo mo pulley so you can drill metal if you need to. or some members just put a DC motor and a switch on theirs.
i like those stops and did you buy them with the bench or where can you buy some?
ALL: I've owned a few of these 8 foot butcher block benches and the older Gladiator versions had better frames than the Chinese Costco ones like i have in my garage. with all the weight i tend to put on mine i noticed mine was starting to sag in the center like a few that i've passed on so i put in a temporary brace of a T made out of 4x4's for now. I measured both ends at 40 inches off the floor (yes the bench is raised up a bit cause i'm tall and my cabinets under it needed some more room) so with the old 4x4 being 4.5 inches wide i cut the other oak scrap 4x4 to 35.5 inches, removed a lot of stuff off my bench, then jacked up the one end and put in the T. then since the one end wouldn't go all the way back down i put maybe 400 pounds of tools and steel plates on the end and it has settled back. maybe not a perfect fix, but at least the bench won't get worse than when i load it back up on top.
anybody else own this bench and do something similar? i was going to put steel under it, but my Makita chop saw and wood was too handy and easy for a quick fix. i could have done it a bit nicer by 45 ing off the top brace, but wanted to see how it works first.