Mike Oehler's engineering tables spec out the girders and beams to be Fir / Larch.
Can I use those engineering tables with other types of wood? Does it make a big difference what type of tree you use? Are hardwoods or softwoods better?
Those who dance are thought mad by those who hear not the music. This tiny ad plays the bagpipes:
Heat your home with the twigs that naturally fall of the trees in your yard