Personally, am wary of timber, because it can move according to temperature and humidity.
Fortunately, before retiring, was able to buy some redundant steel benches (60" x 24" , with 1/8" steel top) from my workplace, 2 inch angle or box section framing, . The lathe, all 300Kg of it sits on some ex Supermarket warehouse staging. I was amazed at how strong and stiff it is,(3" x 2" galvanised box section beams, mounted on diagonally braced channel section end frames. Shelves, above and below, using the same beams, add extra bracing. The machine benches sit on 2.5" x 2.5" angle iron bearers to spread the load on the floor.
The bench under the RF25 is reinforced with 2.5 x 2.5 angle to form runners for drawers.
The tops are high by most peoples standards, but as already said, minimise bending and the resultant backache.
Probably overengineered, but stable and pretty immovable, and excellent value for money, as all bought as scrap!
The chap who bopught my ML7 mounted it on a frame of angle iron, with all joints welded. Again, a rigid construction, which is the objective.
Howard