Made entirely from plywood and Wood glue.

Step 1: Cutting Legs

First I Marked out the shape, hight and thickness of the legs etc.
cut them out with a wood saw and jigsaw.
Use it to template the other and cut.
I used a router to bullnose the edges then sanded it down.
Then Iarked the thickness of the ply and cut half joins, one at the top and one at the bottom to fit the legs together.

Step 2: Fixing the Legs

Make sure it's a nice tight fit on the half cuts then glue both sides.
Take a scrap piece of wood and place over the join and tap one down into the other.
Wait to dry

Step 3: Glueing the Top

I cut strips of ply at 40mm and glued them together, clamped and left to dry.
Once dried I planed and sanded it.
Next I measured the diameter I wanted, leaving 10mm either side of the leg top.
Marked it and cut it out with a jigsaw.

Step 4: Notching Out the Leg

I simply placed the cut out top and placed it on the legs and marked it out.
Then I plumbed lines down to the thickness of the tops levelled back from it and cut them out on the inside of the lines.