Morning All,   As a few of you may already know, I've just started planning a build which is going to center around a huge double height room (8m x 10m floor plan minimum). Main priority is to get no-frills well-insulated space on a tight meter-rate although good acoustics would be a bonus.   It seems so far the only way I'm going to get this amount of clear, open space without huge costs (although I may well be wrong), is a steel portal frame construction which there is amaz