I'll see what it looks like from the other side...
what made me think it was a hopper was the reasonably straight end of the arching and the unhappy state of the one outbye.
Thanks for the offer of the steelwork, I'll report back with the painful reality and think about organising a Sherpa day.
On a mundane note, what's the best timber for underground? I can remember Warren telling me but my head has turned to jam. I do have some creosote should anyone want refreshments 🙂
Don't look so embarrassed, it's a family trait...