Thanks everyone for the compliments. It does heat the house very nicely eventhough the great room to the right has a 26' ceiling. No, I did not do the stone work,, a guy from central Maine who also did the foundation work did it. The chimney and stone work is not a true masonary chimney,, it's weight would have been massive. Instead it is a plywood box 10'x6' with the stones cemented on but still has the look and feel of a conventional masonary chimney. It still has some weight to it and is supported in the basement with columns. The cook stove exhaust pipe connects to a metalbestos pipe that run up inside the box and through the roof. I did not need a baro because the smoke/fumes run under the cooktop, around the oven , down the right side and under then exit up the stainless steel pipe at the rear.
Regarding the question to the timbers ,, the vertical ones are 8"x8", the horizontal ones 8"x14".