re: Brave or Stupid?

I don’t care much for this particular design . Visually , it looks unstable . It looks structurally sound as a rock , and probably is .
That may be the designers’ way of showing the cleverness of his joinery ,drawing
one’s eye to the ‘Gordian Knot ’ of the tapers towards the joint .
You could shop this around to some timber framers ( don’t know
what they are called in Ireland : ) ).. , and see how
much they would charge you to build it , as a reference for your quote .