The customer wants the rotten timbers replacing with new boards to the front of his shed.
So let’s get to it, take some measurements and get the timber from JT Atkinson builders merchants. Having removed the old boards from the front I can see that the timber frame is also rotten along the base and up the 3×2 stud work. I will have to cut the old and replace with new.

There now it’s time to fit the boards to match in with the existing Shiplap.
Job done, including using up the leftover shiplap board and replacing it on the door to match in.
Now to get the rotten timber to the skip. All in a day’s work.