This will be a single column pedestal stand, following the line of the back-saving bedroom bookstands I made for my wife and I. Originally they were cat stands with carpet on top, but our cats studiously ignored them. These were both intended to be prototypes, but have worked so well I've left them as they are.
As with most things I started with a mockup of the typewriter stand, putting the typewriter on folding table and shimming it to the right working height with different thicknesses of books.
Two 3/4" thick planks of oak, cut to length, would make the column, with tenons on one end of each to go into a base. I ripped one down the middle.
With the other plank I used a Record plough plane to cut a 3/4" groove down the middle of each side. I did this in two passes, using a 3/8" cutter.
When the grooves were cut I flattened the bottom of the groove with a router plane.
Now the first piece of the halved plank is gluing in one side of the ploughed plank.