Thanks guys.

I can make it out of 6x6 no problem. I will be using red pine. I went to Northhouse so I have some experience. I operate a saw mill and built the house myself. The truss will be spaning 12 feet and will be on two maybe three concrete split face block piers. The porch will be built off the gable end of my house and I plan on using conventional framing to tie it back to the house. The house is on a 8 inch block fundation so I cannot really set posts back at the house side of the porch.
So the heavy timber frame will be isolated out on the piers. The porch will be out 6 feet from the house. We are heavy snow load here in Upper Michigan.