Pipes? What Pipes!

Following yesterdays blip of the poor floor and markings of possible pipes had to record the finished surface!
Fitters (two) started by fixing a 6mm marine ply over the floorboards (and pipes!) then applied the cushion floor! Clearly Master craftsman on the job, no faults all is bliss!
Just confirms better to get the specialist in; I cannot yet work out how they got the fitting so close and smooth, my previous efforts always allowed for "give" usually half an inch or more!