This timber truss is a good truss system for small, simple structures such as cabins in non-code areas. Having trees of the right size and type nearby is an obvious plus. In many areas of the US you can legally cut trees from national forests with a low cost firewood permit. Instead of cutting the trees into firewood, you can produce far more valuable building materials such as these trusses.
Timber connectors, such as the Simpson Strong Tie timber connector shown below, provide greater connecting strength. Flatten small areas so washers will sit flat.