I found most meditation benches are too low and cause knee pain.
To correct this I built a taller bench and then place a pillow under my knees. Sort of like a balance chair. My height is 5′ 10″. I find it much more comfortable.
Rear heightFront Height
Width of Bench
Depth of Bench
Legs are made of 1/2 inch plywood. Thicker would work, too.