Here’s what we’ve got so far!
L-shape dormer from inside.
Next steps = 1st fix electrics (laying wire to approx the right positions for plug sockets and light fittings), 1st fix plumbing (when pipes are laid and we find out if we need to have a macerator or not). Staircase has been ordered. External windows and doors have not because I wanted to hold back so that we got the sizes just right.