The Garden Room!

This is a model of the garden room that I'm building. The walls will not be gaping holes, nor the door and windows bits of paper! The walls will be a sandwich of ply, insulation, OSB and cladding, but I'm interested in the model in working out how the skeleton of ribs should go and what sort of joints I need to make. The grand piano is courtesy of Gillsabroad, who has sent a brilliant parcel of goodies to Cath (see her blip), and included a little kit for me to make a grand piano! So of course I did, straight away, and it's just about exactly the right scale for the new room! Thank you, Gill! How did you know??