Just a simple question, I'm having some steel work installed as part of an extension, the structural engineer has been in and done calculations and given pictures of graphs scales etc showing this that and the other. Now he has specified in his drawings the size of the steel 254x254x89 and Column 203x203x46uc to hold it up and how its to be put together. Now who measures the lengths etc and heights of it all?Is this the builder?