What can you use those wood ashes into? Make lye water out of ash. You can boil spoons of ash (clean white/grey fluffy ash) with water and then filter it with a coffee filter. Lye water is a great cleaning agent and sanitizer for .
You may refer to a truss as the rafter, but it's basically the skeleton of the roof, carrying the weight of the frame and supporting the walls of the building. Trusses are very important to preventing the walls from bending or flexing, more so.
studio: Olson Kundig’s Single-Room Gulf Islands Cabin is a Minimalist Retreat in British Columbia Gulf Islands Cabin-Olson Kundig Architects – Inhabitat - Sustainable Design Innovation, Eco Architecture, Green Building
Bunkhouse: DIY small cabin retreat: 130 square feet plus a deck - sleeping loft, IKEA furnishings (like a table that folds against the wall when not in use), barn door that opens the inside to the outside.