I spent most of my working life in architectural design so will have lots of fun here, thank you Sue. I shall be scribbling sketchy stuff down on paper to ignite ideas out of this old brain! Can’t promise anything though!
Do you get early morning sun shining into the end facing east and sunset shining into the end facing west? Are there good views from both ends, worth enhancing from inside?
Would you be putting the veluxes over those 2 doors and the window on that back wall to maximise light into the rooms behind them? There will obviously be less light into those rooms once the terrace is roofed over, if you don’t want a glass roof.