I'm going to waffle so key points are in bold! So I'm taking on the task of refurbishing the flat above my workshop. It's an old building (somewhere between 1888 and 1910 I think) and has been offices for most of the last 40ish years at least. A couple of walls have had crappy looking repairs done before which I'm planning to cut out, board and skim but the ceiling I think is too far gone. It's lathe and plaster and bowing in the middle. There's also been 4 or 5 repairs done to fix water ingress in the past. I think my best option is to make sure the original ceiling isn't going to fall down and then build a new one underneath it, but the big open plan room is 10 x 5 meters and I'm unsure of the best way to do this. I think metal frame looks good and it's less weight to be suspending than using timber. The perimeters are all brick so I'm assuming that here I can fix the MF with Rawl or equivalent fittings? For securing the span what should I do? Drill through the original ceiling and hang an adjustable rod or something to the original beams? And what should my spacing be for a single layer of 12mm boards? I've done just about every DIY task and build tons of bizarre structures but somehow managed to avoid all plasterboarding and plastering until now, looking forward to sinking my teeth in with a bit of advice!