L
LesD
Hi Les
Is it imperative that the door be centred on the rim of the tray.?
There may be others better qualified than I am to reply but provided that the door frame can be sealed to the wall tiles and the rim of the tray, whether it is exactly centred or not shouldn't matter. I have just had a look at mine and the bottom is forward of centre of the tray rim because the verticals are not symmetrical inside and out. I guess the answer has to depend on the particular door you have to some extent.
Have a look at the picture I posted and see if it helps you make up your mind.