This is something that I did to make an adjustable type table that still has knee room if you need it.
Cut a piece of 3/8ths inch plywood, 24"x60".
Take an old ironing board that is adjustable in height and has a mesh type metal top.
Bolt the plywood to the top of the ironing board by going through the holes in the mesh top.
Either pad it, and cover it with duck cloth, or buy one of June Tailors ironing pads that has the grid already printed on it. JoAnn's usually has them.
The one from June Taylor will not be accurate as far as using the measurement grid because it has not been preshrunk would be my guess.
If you make your own, you can preshrink the fabric with steam, and then make your own grid using a ruler and an indelible Sharpie.
This makes a great ironing board for pressing fabric widths.
You can extend the size of another smaller table by placing this next to it and adjusting for height.