I'm sure there are loads of way of making trellis with hazel branches and the like, but my solution? I'd just pop down to the local DIY shop and see what they have. China seems to be able to mass produce just about anything these days, so I don't see why they couldn't get hold of exactly what you have in mind.

Just my thoughts though...if you really want to go for that 'home-made' look, I'm sure there are loads of people here infinitely more creative and experienced than myself...