Hi Yooperdirt,

We can see what others have to say, but 6"x4" for a King Post Truss is pushing it without going into some "laminate design" types, or more advanced joinery to make you demensions work. Have you done a lot of timber framing? It's doable, but you really should have a PE look at your design before moving to layout and jointing. Also try posting on:

http://www.forestryforum.com/

Regards,

jay