This is alot more difficult than it looks, primarily because you have to slot the tongue and groove boards together, which will always give you a gap the depth of the tongue at whichever end you finish. I have done this on a toilet and the best advice I can give is to start at the toilet and work outwards. If you are going over the top (ie infront of the cistern then you will liekly have a small gap when you do the other side as this will be equivalent to working from the outside in. From then on its a bit of trial and error to get the shape right. In the end I mocked up with a pencil line on a bit of T+G and cut the shape, noted where it didnt fit and adjusted on a new board and tried again until I got an acceptable fit. It wastes a few T+G boards, but they are very cheap.
One other thing to note is that you WILL need to get to the cistern at some point, usually just after you have finished the job. So do not nail all the boards in place, screw them and use cup washers so it doesnt look like a bodge job.
Two other tips - you could cut the tongue off the final board and 'place' it in position, but given toilet bowls are odd shapes this may not help much. you could also consider using T+G patterned MDF sheets rather than individual boards, but as most toilets are small I found manouvering the boards enough of a pain without going up to a sheet and trying to wiggle it into postiion. Also one mistake and its alot more expensive to replace a sheet.
HTH and good luck - its not a job to be rushed or for the faint hearted!
Steve.
) with tongue and groove.
