How about a non-table? Mount the enlarger to the wall and build a drop-table below it, like this:
I can remove the table completely and put the easel on the floor for max prints.
The table has three suspension points (rather than four) and adjustments to set it level.
This is what I did for years. I mounted two enlargers side by side on a fixed narrow platform by the wall then had a wider bench (otherwise similar to Leigh & others and the magazine article) which fitted flush with the work bench, or could be fited in two other position to allow greater enlargements.
Thanks for starting this thread as I am interested in building a table too.
The first example you show is almost exactly what I had in mind. My darkroom has a rather low ceiling so I have the Beseler 23 on a low table. After a session my back is killing me. The example table will allow me to raise up the enlarger where its more comfortable for the usuall 8X10 work, but still make big blowups by dropping the easel. Thanks for the posting.