Due to various circumstances, part of an exterior wall started to be torn down at home, which has now become a project to tear down the entire exterior cladding, add insulation, and put up new paneling. 
Background and future:
Wooden house built in the 1930s, the walls are essentially uninsulated vertical planks. Tretex on the inside. The walls are currently about 180 thick from the inside to the outer edge of the cladding. All walls will be furring on the inside with 45s for installation space and insulation. The exterior will also be redone with new cladding and additional insulation. Only the exterior of one wall will be done this year due to an extension and extensive internal renovations coming up in the next year or so. The roof will also be replaced/reworked soon to achieve a proper eave and roof overhang.
My plans for now;
Tear down all the exterior cladding and the approximately 60-year-old, broken, poor wind barrier that is directly on the plank wall.
Frame with 70x45 standing cc 600 and insert insulation boards, frame with 45x45 cc 600 horizontal and insert insulation.
Apply windy, or similar, and attach battens, 28x70, as nail battens over the horizontal 45s.
Finally, put up the outer panel.
Questions:
Am I missing anything here? Am I thinking wrong somewhere?
What insulation should I aim for? I've been looking at Isover's facade insulation board, but maybe there's something better?
Should I use "windy" even if I'm using Isover's facade board?
How do I handle windows and doors? They need to be moved out to the 70 rule anyway.
One window will later be turned into a double door - how do I make it easy for myself when the window is to be removed and the door installed?
Thoughts, suggestions, tips - fire away!
Background and future:
Wooden house built in the 1930s, the walls are essentially uninsulated vertical planks. Tretex on the inside. The walls are currently about 180 thick from the inside to the outer edge of the cladding. All walls will be furring on the inside with 45s for installation space and insulation. The exterior will also be redone with new cladding and additional insulation. Only the exterior of one wall will be done this year due to an extension and extensive internal renovations coming up in the next year or so. The roof will also be replaced/reworked soon to achieve a proper eave and roof overhang.
My plans for now;
Tear down all the exterior cladding and the approximately 60-year-old, broken, poor wind barrier that is directly on the plank wall.
Frame with 70x45 standing cc 600 and insert insulation boards, frame with 45x45 cc 600 horizontal and insert insulation.
Apply windy, or similar, and attach battens, 28x70, as nail battens over the horizontal 45s.
Finally, put up the outer panel.
Questions:
Am I missing anything here? Am I thinking wrong somewhere?
What insulation should I aim for? I've been looking at Isover's facade insulation board, but maybe there's something better?
Should I use "windy" even if I'm using Isover's facade board?
How do I handle windows and doors? They need to be moved out to the 70 rule anyway.
One window will later be turned into a double door - how do I make it easy for myself when the window is to be removed and the door installed?
Thoughts, suggestions, tips - fire away!