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Well today has been a long day! I built the new carcass. It's dimensions were not exactly the same as the old one, but managed to get it on the wall brackets. Also after two attempts have drilled the holes for the hingy bits and am happy that they are in the right place now. Burst a blood vessel in my finger, but it feels ok now. Couldn't have done all this without your shared knowledge. I was lacking a bit of confidence, but now feel great that I have got this far. I just have to screw through to the back wall to make sure the cupboard is absolutely safe. Many thanks to you all.