I should say that the last photo is from January, so there is a bit more progress to show, including insulating.
Next job was install the joists. I opted for a part joisted, part open design to give me some storage and still have a feeling of space. At the far end, away from the main opening, the joists are sat directly on the walls to give maximum storage above and the rafters were spaced closer to together at that end for maximum weight bearing capacity. I installed one more joist than shown on the sketchup drawing to extend the area slightly. The thinking being that this end could be totally enclosed from the rest of the garage at some point in the future if a home office or small workshop was desired. I'll be leaving it open to the garage as it suits my needs that way. At the other end I have installed the joists 200mm above the walls to give a more open space, and I will only be putting bulky but light items at that end as the rafters are spaced out further.
January 2021
As time allowed I then lined out the walls. Still being in the worst of the weather, and being aware that it was likely to be exposed for longer than was ideal, I made sure to leave a good gap between the OSB and the base so that they didn't wick up any standing water. When it is all completed I can install skirting to make it neat.
March 2021
Next was to line out the roof, which I wasn't looking forward to. The walls were easy enough to deal with alone, but trying to hold a full sheet of OSB above my head whilst screwing it in place was going to be a different kettle of fish. When the weather improved in early spring I decided to give it a go. Unfortunately a winter in the open meant the roof timbers weren't quite as square and true as when they were installed. It was nothing to be concerned about, but it meant that simply offering up a sheet of OSB and sticking some screws in was now made a bit more of a faff. After several hours of trying to get a single sheet installed and failing miserably, I gave up and retreated to consider how I was going to achieve this in a safe and timely manner. Fast forward to July and I had the somewhat obvious idea of simply cutting each sheet into thirds, and installing these smaller pieces. Obviously it involved a bit more work, but it made it perfectly manageable for a person working alone, and brought my mojo back.
July 2021. First sheet cut into thirds length ways, and then installed.