I'm pondering now on how to make the connection between the large top front beams. They measure 200mm x 200mm and ideally I don't want to see any screws or bolts.
What I want to do: There should be two lag screws in each of the notches on either end of each beam that connect them to the vertical support. I can then fill the notch with a custom fit piece of wood. I can then also screw the custom fit piece to the beams for extra support from the top.
Do you think this will be strong enough? Are there any better idea's I'm missing? I find it hard to find any good resources on this.