Each side of the engine once the side covers were removed:
You can already spot some trouble with the shaft that actuates the clutch through the engine from the left to right side. It's located right in front of the sprocket shaft and it's not looking too straight (I pulled it out a little to inspect it).
Here you can see the oil level as it sat for decades, outside, with oil in it. Since it sat outside the oil was a good thing to have in it but what a mess. If the bike had at least a thick bedsheet over it the whole frame and engine would have been in much better condition. <_<
