I made this design from Matthias Wandel a few years back, and it has served me well. I had a big piece of laminated MDF that someone left in the garage after we bought our house – perfect for the top. I do with that I had something heavier for when I need to whack a chisel or do some ripping with a handsaw, though.
The aprons keep it nice and sturdy. Although now I’m at work and wondering if I added a stretcher along the bottom lengthwise… I can’t recall.