Well guys,
This is going to be somewhat of an anti-climax, but I've been taken off that particular job and moved on to "the next big thing" (another shed, groan).
I would have loved to have seen how this generator thing panned out, unless I get sent back there to fix something up in future, chances are I'll never set foot in that shed again, dairy construction is like that, but at least you get to see a fair bit of the country-side.