Bathroom Layout and Toilet Plumbing Questions for a Small Ensuite

[WoOt]

No restrictions on door widths, I've got a 600mm on my toilet and works fine. Opening will be door width, plus 2mm clearance either side plus lining width. I'm not convinced a flush pipe will work properly going round two 90° bends. Possibly a quadrant shower or (I don't know the technical name) a square one with the corner "cut" off will allow the door to be further to the right.

If you like a bit of hard work you could knock a few bricks out of your inner skin:

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Went a bit more belts and braces, especially as my insulation in that area wasn't great. So dug it out, fitted some solid sheets and filled all gaps with expanding foam (not pictured). And also fitted a lintel as I had one lying around anyway.