I would fail at planing and sawing the ends if the top were to be secured in the front vise; just because they would either be 6 ft up in the air or the work having to be done vertically.
Heh. Kind of an important point, eh? Good catch.
Here’s another option: Convert the ends to breadboard ends. Now the 0.7m of end grain becomes 0.7 m of long grain and can be done in the vise before applying the breadboard. Also, the end grain grooving is reduced to the width of the breadboard end.
A third option is to change the profile: Instead of a groove, do a rabbet all the way around the perimeter (imagine cutting off the lower portion below the grooved edge. Now, put a chamfer on the lower edge. All of these operations can be done with the table top laying flat on the bench, upside down. Don’t underestimate the fussiness of a 0.7m wide cross-grain rabbet, though. Definitely doable, though. This design would produce an even lighter edge than what is in the photo…perhaps too light, so fool around to get something that looks right.