Oh wow. I guess that answered my next question. I'm going to bookmark that post for later consumption.

I probably won't go with the wedged tenon, for this particular joint, as the wedges will never be seen. However, for the rails (the bits that join the legs together at each end, I'm thinking the wedged tenons might be a good look, although I have no contrasting timber harder than Karri.

I will practice a couple first though.