We were concerned about expansion/contraction/movement so elected to do this rather than skim. As a result the finish isn't 100% but, by way of comparison, it's better than most of the walls in our 1930's semi!
We might (depending on how the walls hold up) put lining paper up and then repaint if we want it better but I think it's unlikely we'll go the effort.
I took the laziest route in the world and put up the plasterboard, filled the gaps, and painted. I didn't even go as far as taping though, in hindsight, I wish I had as it would have improved the finish. However skimming feels like overkill unless you are _really_ making a new room. I'll try and update the blog this evening with some final thoughts on design and build.
One thing I have noticed is that, with the sunshine and dry weather, the height of the external walls has shrunk by 14mm! On my 'Build Complete' post (http://buildingastudio.wordpress.com/2012/07/16/build-complete/) you can see I put up some trim strips around the top of the wall to cover the ugly gap. Last weekend I had to drop them all by half an inch as they were just beginning to brush the ceiling. It can't be settling as the external structure has been up for ~3 months so can only assume it's expansion and contraction.
I was paranoid about this and designed my structure accordingly. I feel slightly vindicated in my paranoia but it's definitely something to be aware of.
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