My walls were out to but had the tiler build out the wall when he tiled to lose a few mm. I had a banana wall 10mm and he got it back to reasonable for brackets and silicone to hide.
Something for the next one
Agree with what you did but next you'll know it pays to know a Glazier! What's a base worth? Not a huge difference to go frameless when you know a glassy... Just don't measure wrong like I did! Then you'll lose a couple hundred easy done:D