Socket Systems manufactures a steel coupling system called Lumber LInk.
This 1/4 inch plate steel joins 6x6 timbers to create a clear span building up to 30 feet wide and 60 feet wide using 6x8 timbers. Frames are assembled on the ground with your choice of gable or gambrel roof and raised into place using the foot locking system. No cranes or lifting equipment is needed. A second floor can be installed using metal I-Beams or wood members. Vertical supports are not set into cement to eventually rot, but are safe inside the foot fixture. Lumber Link uses no treated lumber and less wood than typical trusses. Want to re-think how you build?