Thanks, unfortunately, that's where I'm struggling to find things... Though Japanese-looking on the outside, the inside has to be practical with benches and a low table for the odd bbq... things I'll have to make I suspect...

Thanks. I've made an update here: kzfaq.info/get/bejne/m8V-lLtn2Neac3k.html

Hi, metal braces from Screwfix www.screwfix.com/p/heavy-duty-angle-brackets-galvanised-90-x-63mm-25-pack/69361 I've used a few packs of these on various projects wanted to ensure that it could handle at least 6-8 people when sat inside, plus tools. They're zinc-coated, but remain hidden once the panels are in place. Hope this helps.