I made a hospital adjustable bed for my wife when she had cancer. And her best friend saw it so wanted one for her husband who was bed ridden. The top is 34"X19", which includes the 1 1/2" oak bull nose edges. The top is 3/4" plywood with a Formica overlay. All the rest is solid white oak.
The steel tube that holds the wooden post is 21/2"X21/2" O.D. and has an aluminum channel for the hand screw to tighten against.
There are 2 oak runners lengthwise under the table with a couple of oak triangle braces for support. Everything is held together with screws and glue.
There are 4ea. 360° swivel castors on the base.
Height adjustment is 341/2"-45", floor to top of table.