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RE: The bathroom ceiling removal.
I'm not sure how feasible it is unless you're changing the roof at the same time. My pitched roof structure was made with 3" x 2" timbers in a 3 sided-triangle formation. We changed these for 170mm x 50mm timbers so it will be stronger as they're now just one side of a triangle.
Once you take off the ceiling you can work it out but it's not really something easy to do if you're trying to keep the roof in place.
Studded out the bathroom. Just need to order some insulation for the roof now.