When I was in the DO, I had a bit of an argument with the Sheet Metal Foreman....the argument ended with him saying, shouting really, something like ".....dimension it how you jolly well like old chap, we will be pleased to make it, however you have drawn it", or something like that. So the next thing I drew, I dimensioned in Cubits, there was even a scale to convert to other obscure systems.
Although I really didn't like the SM Foreman a great deal, to give him his due, he saw the funny side and we had a good laugh as I handed him the up issued drawing with "conventional" (but so boring) dimensions.
cheers
Bill