Checking the weight

My first idea is make a cushion seat with leather cover. But I found out that it need a lot of steel, the material as I use for my frame, and the mesh and cushion. It's considered quite a lot of weight for the stool as i weighted them in workshop

From the experiment with material before, I tested plywood mostly and it's pretty light. Also it help me minimize the use of mild steel. The shape a bit change but still able to give a visual triangle

2 front legs are flatten a bit to make the stool stable and easy to assembly the frame and the plywood. The frame is minimized a lot, but still strong.

Well, somehow it has a trapezium looking from any side  of the stool. Quite satisfied with this result!