Just flicked back and clocked where the skylight/roof slope is. Suddenly your plan makes a bit more sense and my suggestion less, but will doodle it out if I get a min.
There is a limitation on the toilet as that is an external wall - to take the waste out from the opposite side would require going through the joists.
@Bainbridge started
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Just flicked back and clocked where the skylight/roof slope is. Suddenly your plan makes a bit more sense and my suggestion less, but will doodle it out if I get a min.