When constructing the dollies to support the upturned hull I made sure they were of the correct height for the hull to be level, but of course had zero expectation that it would be level at first attempt.
I was right. A level laid along the keel showed it sloped downwards front to back, like this.
Likewise the level laid across the keel showed it also sloped from side to side. As here.
Not surprising, really.
So I purchased a small bottle jack to lift the hull for levelling. It was very good value for money, which is not something which can be said about most boatbuilding materials.
Here it is in action.
Note the wedge on top of the dolly to raise that side to make the hull level.
That didn't take long.