I think some of you might be over thinking this. He didn't design it. He didn't engineer it. He isn't going to install it. If he's still concerned about liability all he needs to do is tell his customer is "I can't weld this if it is a railing because it is sub code but if it is a pole bean trellis there isn't a problem." Man it sure would nice nice if I could get the kind of rates here that some of you guys take for granted.
Sberry- I used to do a lot of work for farmers. I couldn't believe how some of them treated their equipment. My method was to build the repairs strong enough to shift the next breakage into someone else's engineering.