Hi,
Thanks for your replies!
The use of the two different sizes of vertical supports is for astethic reasons (supports vs. window frames).
The vertical timbers on the bay needed to be wider due to the angle of the cut of the horizontals - resulting in a surface 'longer' then the width of the 80x40.
The vertical timbers making the doorframe are sized to fit flush against the stone while creating a doorway of the right dimensions to fit the odd sized doors.
The actual sizes in that diagram are picked from the sizes that were shared by a couple sites I found selling cut hardwood. I found it harder to find 96x96 and was concerned that 69x69 may not be strong enough, but the more I think about it the stupider it seems to use these odd sizes (may I blame the heat when I was drawing that?
).
The roof is where it gets tricky. I am completeing this project started by someone else and the stone base is already built; the problem is the dimensions are just so that the ridge boards (main and gable above door) mismatch by a few cm, as a result the glass (where the porch/main body meets) doesnt/won't quite meet up. (This is also why the doors (already bought) and doorframe are an odd width.)
I got alot of help in a couple of threads about the roof design in the joinery section and as a result I think the best thing would be to use a roofing kit; so worst case the roof will be a timber frame, supporting plastic/aluminium kit bars and 4-6mm toughened glass. Best case is I use the self supporting roofing kit which will have aluminium supports.
The difficulty in the roof design though won't go away no matter what I use to build it so I was hoping to get on with the timber frame and come back to the roof when I had some exact measurements of what I would be working to. The image below shows the kind of roof i'm going for.
In any case the roof will be built seperately so no cuts will be made to the frame in the diagram.
