Home DIY

I wall mounted a concealed cistern, boxed it in and connected it to a floor mounted pan and it hasn't exploded into a shitty fountain yet. Vertical soil pipe in this case which was a mega pain in terms of positioning but eventually just about found a combo that worked.
The cisterns have a spec explaining how much drop there needs to be to the pan etc. Double check all your measurements. I fucked up a bit but managed to get away with it so far. I have photos I can dig out if you like.

Good to know. I'm really after reassurance that a 19mm sheet of ply is enough to hold a cistern with 6 litres of water in it in place. I should probably ask my father, given that he's an architect so should probably know about these things. He does however tend to have an alarmingly laid-back 'it'll be fine' attitude to most structural things. Benefits of being retired, I suppose.

I am not a plumber.

You and me both. But hey, how hard can it be?