Feeding all the pipes through the timbers took ages, so much easier having 2 people doing it.
If you could see the pipes either side of the cupboard before it was plaster boarded you wouldn't think it was so neat! Just be careful when threading them through as if they rub together they wear down fairly rapidly.
However much 15mm Hep2o you think you need, double it!! I'm sure there is less on the roll than stated.