I have added some drawings.
What wall space is there to the right of the 300mm pull-out? i.e. are the doors to the conservatory in a reveal?
Its a 50 mill max infill strip and I don't think there will be room on the adjacent wall. I don't know about round the corner into the conservatory.
Fridge freezer switch in our existing house is in a wall cupboard
and has been switched off a couple of times by plates being placed in cupboard.
They could be placed higher up out of the way but then you would need something to stand on to reach them, Not good if you are in a hurry.
I asked if you could stand to lose the bottom 15-20cm of space in a wall unit, as my idea was to have them all there, but not on the sides - I envisaged them on a panel set below the bottom shelf, in the shaded area in this rather wonky sketch: