My favorite jointer is one I made in the 70's. It is 4" square,and about 30" long. I'd have to go measure it. The blade is 3/16" 01 steel.
It is a monster,but works very well.I used to have to plane the plough press at the book binder's shop. It was maple,and about 8" wide and 3' long. It holds books while the plough plane(which I made) cuts the edges of books nice and evenly.
I'd take the big plane over there and plane the big press in place.
This was before I became the toolmaker. I had no beech,but there was a big maple 4x4" in storage that was partially turned into a bed post on 1 end. It must have been at least 50 years old,and was very dense.After I made the plane,I stopped up the throat by clamping it against a piece of wood. Next,put painter's putty in the bottom of the mouth. Then,I filled the throat many times with raw linseed oil. This bled all the way through the plane out to both ends. It added to the mass,and made the plane very stable,and lubricated to slide easily.
P.S. I added some things,and corrected spelling. I was in a hurry when I posted this.