did a wetroom last year with tiles aligned horizontally and vertically with 3mm spacers, I was chuffed with it just a shame the customer never seem to appreciate the thought that went into it!
They will in time. He'll be lying in his bath one day and start to realise the effort that went into it.
Off topic a bit but I managed to get some holes drilled in a couple of tiles to accomodate some chrome ch pipes coming out of the floor. I asked the customer if they minded me risking flooding the room to do this as the ch wasn't going to be drained. He was happy to take the risk. I probably lost about 1/2 a pint of water in the process, and it looks really neat.
Customer, who is a bit of a perfectionist, can spot a squint
tile or line at 100 paces, was really chuffed.