The design is directly inspired by the very detailed build of the Roubo (a French woodworker that published in the 1770 years an encyclopedia about woodwork : http://roubo.art/planches/tablePl_p1.htm) bench found when looking at how to use that lead screw in an appropriate way : https://t2woodworksplus.wordpress.com/2016/12/29/roubo-est-arrive/ (it's in French but Deepl is your friend and there are a lot of pictures, quite long but very rich in hand tooling use).

Lying on the back before its too heavy.

The top board isn't thick enough with 40 mm only, I don't have big enough pieces of oak to make the 100 mm thickness required so its thickened with some 16 mm and 23 mm thick wood floor. 16 mm every where and some 23 mm under strategic places.

The top part of the leg is 40 mm thick also, so the thickness of the final top plate is between 56 and 80 mm, good enough.

As I can't make it long enough, it will be 700 mm wide at one end, so the two original legs are on both sides of the width, with additional heavy twin legs in the middle, and  two smaller legs on the smaller end.

The front jaw of the press on the back, with wengue finish, the cross mechanism in front with the nut in place.

The cross mechanism is home made, a big bolt cutter in perfect shape has been sacrificed because drop forged steel was necessary to have a tight thing that will not bend under pressure (I still have a big bolt cutter, in worse shape, but it was too big for the need).

The two sliding ends have a big bearing to slip well, and there's a small one in between the two arms.

Both front and back jaws are an assembly of 9 mm thick and 49 mm wide pieces of some plintes (the full size of the plinths is 68 mm but the the edges aren’t flat : one is rounded and the other has an angle, so it had to be reduced to 49 mm to have a square shape) glued together on an bigger central piece that was the link between the two legs of the table. Some pieces of a rustic 30 mm thick door recovered from an apartment left 30 years ago finally found a respectable use.

The front jaw is finished with some wengue recovered from another neighbor who changed the wood floor of his bathroom, it had been black tinted so from the original 14 mm thickness it has lost around 1 or 2 mm after sanding, but that wood is so beautiful that I don’t regret the time spent on it to recover the natural color of the veins. And really don’t understand how you can buy such an expensive beautiful wood... and paint it black !

For the back of the rear jaw, a piece of 30 mm thick beechwood swedish brand kitchen counter top has been used : the nut is going to give a lot of pressure when closing the jaws so it must be some solid stuff. 

Of course I should have made the hole build in beechwood, just like the real Roubo ! Its fine grain is perfect for a bench because it’s hard, it doesn’t move with moisture and temperature differences and if there is an accident, as the chips are small, it’s located in a small area, oak have big veins and accidents can make much more damages (wengue is awful for that, very difficult to work with, and its splinters are a real pain), but oak was available for nothing and not beechwood, and it’s a beautiful hard wood too. I’ll try to be careful to avoid accidents. 

And I’m very confident about the dryness of the woods used : the table was at least 70 years old and the wood floors around 20, so it’s not going to work as if it had been cut last year, in fact, after two years of using the bench, it didn’t move at all, although not finished yet.