As a structural engineer (in training; still have to decide when to take that wonderful PE) I would just issue some caution. As long as you are not trying to do anything fancy you probably could build your trusses. Everyone here can probably build a wall without consulting and engineer. 16" OC studs with 16 penny nails. Why? Because years and years of experience leads to a standardized strength that works. If you are copying a rafter design and making it into trusses you most likely would be ok. I do like the idea of using the metal plates as opposed to just plywood for the gussets. My dad built a small gabrel roof barn (like you buy at the box stores) and made his own trusses out of scrap wood and used plywood gussets, however the span of the trusses are only about 10'.
Like others have said you should use good straight grained wood. Also try and keep the bracing lengths to a minimum so they don't buckle under wind/snow load. Make sure you brace the ends of the building for wind and cross brace the trusses together to prevent racking (the perpendicular furring strips do not provide proper racking restraint).
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